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The South America Arc is the eleventh story arc of Dr. Stone as well as the second story arc in The Truth of the Petrification Saga.

After escaping Stanley Snyder and establishing a peace treaty between |Brody's forces and the Kingdom of Science's prisoners of war, Senku and his remaining allies venture to Brazil to find the source of the petrification. With Dr. Xeno as their prisoner, they must find the source and set up Superalloy City before Stanley can stop them.


Pursuit to South America

After narrowly escaping Stanley's grasp, Gen and the others are panicking as they are now being pursued by Stanley and his soldiers, fully armed, and having commandeered the Perseus with the sole goal of retrieving Xeno. While Stanley's men prepare the Perseus for pursuit and take the Kingdom of Science prisoner, Matsukaze is taken on-board after sustaining injuries from the previous attack.[1]

Some time later, Matsukaze is interrogated by Stanley who threatens to kill him if he doesn't tell him where Senku is headed. Ginro, who was hiding but didn't want to see Matsukaze suffer, gives up both his hiding spot and where Senku is headed: South America.[2]

Aboard Xeno's yacht, Xeno reveals that he is aware of Why-man and the signal coming from the moon. Senku and Xeno then team up to exchange information to crack the secrets behind the petri-beam and the moon.[3]

After Xeno listens to Byakuya's message to Senku, they both work together using their respective observations of the event to pinpoint the origin of the original petrification: 3° 7' South latitude, 60° 1' West longitude, which is near Manaus, Brazil.[4]

Finding a new Ally

After realizing that it will take years for them to sail around the continent and with Stanley on their tail, the group decides the best bet is to scale across the the continent itself. Taking a break for supplies on the calaforina coastline, they reach a deserted island. They soon learn they are not only when they discover a geographer called Chelsea Childe, who has the same "fuzzy sickness" as Suika.

After making her some glasses, she eagerly joins the team and tells them that the best way to get across the continent is via motercycles, prompting Senku to create a roadmap in the steps needed to make one.[5]

With Chelsea on board, they update Chelsea is on the recent events such as the Why-man, the plan to reach the moon, and the actions of Xeno. With this, she sides with the Kingdom of Science and joins them.

Despite gaining a new ally, Senku and the others note that they still face a problem with Stanley and his men coming after them in the more faster Perseus. Ukyo even states it will not be much long.

Indeed, one of Stanley's men monitors the radar to keep track of them confident they'll reach Xeno. While a captive Ginro is shown worrying over his allies.

The group note that with their small ship, they could not make it very far but Chelsea remarks on how the wind helped her kites. Getting an idea, the group create sails made from Chelsea's kites. With this, Senku's group elude the enemy at a faster pace while Stanley and his group are infuriated the enemy continue to escape.[6]

The crew, having found a way to avoid Stanley for the moment realize that they will be unable to keep this up and create the motorcycles unless they create a diversion.

Journey to the Source of Petrification

In San Francisco, Yuzuriha revives Joel who had petrified himself testing the petrification device. When the others try to examine it, Minami found out that Medusa's battery has finally died out and they relay this news to Senku. Senku was pleased to hear the news that Medusa has been repaired despite it being out of power.

The team arrive at the Andes Range and reorganize the weight distribution of people across the motorcycles. While Senku builds a scale, Chelsea bluntly asks for Luna's weight, much to her embarrassment. Chelsea prods Luna about her crush on Senku, but Luna insists that they're dating after Senku accepted her proposal back on the Perseus. Everyone else assumes he accepted due to "political" reasons, and that they're not really dating.

The crew start to measure their height and weight, and once the measurements are completed, the gang set out once more across the mountains to reach the Amazon.

In the meantime, Stanley and his gang manage to repair the aircraft and set out to pursue Senku once more.

After The Kingdom of Science make their way into the amazon rainforest Stanley decides not to pursue them and instead makes his way to where they will exit. After creating rubber boots and animal repellent the crew make their way along rafts down the amazon river towards Manaus Chrome comes up with the idea of creating a timed way to use the revival fluid with Senku suggesting that the Why-man might anticipate this and create multiple pre planned attacks with the petrification device.[7]

After a while the crew start trekking on foot to the source of the petrification, with Suika fishing out a medusa from the river, this stuns everyone until they realize that they are standing in front of a petrification pyramid. Senku testing a handful of medusas, causing the others to jump for cover. None of them activate, so Taiju sticks his face into several piles and tries as well. Kohaku and Suika join him as it looks fun. Not a single device is still active.

Senku soon tests them and discovered that none of them work confirm Senku and Ryusui's theory that they'd all be out of power after petrifying the whole world. Dr. Xeno monologues about how beautiful it must have been, seeing the advanced weaponry activate, but it was just a distraction while he tried to pocket one of the devices. Gen notices his misdirection and points out what he did, making Chrome try and snatch it back from Xeno. Senku says it's fine since the device doesn't work anyways and states they can make use of Xeno's research abilities.

With none of them working, Tsukasa begins smashing them apart so they can analyze their inner workings, something the group couldn't do before as there was only one device.

Back on the Perseus, Matsukaze and Ginro wonder where Stanley is taking them. Stanley himself is left trying to figure out what the Kingdom of Science's next move is. They assume the group will build another boat and that they'll be able to catch up with them before they can complete it. Stanley's radar expert says they'll find the new boat using the radar they have.

As expected, the science group is in fact building a new ship, designed to be a Stealth ship so they can slip under the radar. Some time later they finish construction and need to test it as Ukyo doesn't know all the military secrets. Xeno doesn't help either as he wants Stanley to catch them. Ukyo tests the ship using the radar they have and states that "it's kinda hard to detect... for its size." Expecting to have to tweak it, Senku says they'll have to modify it, however Chrome points out that no one on Earth noticed the petrification devices raining down until it was too late.

The Stealth vessel is constructed.

Running more tests, they realize that the devices are invisible to radar, potentially due to them absorbing the waves. Chrome then suggests that they just cover the boat in the devices rather than having to rebuild the boat. After covering the hull with several devices, the group are ready to sail. With their futuristic stealth ship built, they set off back down the river.[8]

Establishing a Stronghold

Once on the river, The Kingdom of Science begins testing the medusas and realizing that all of them need diamonds which haven't been scratched of damaged in any way, Senku tasks the people at Corn City to create a Diamond that can fit into the Medusa. Although skeptical at first if such a thing is possible, Senku reminds them that no matter who they are or what happens, as long as they follow the steps then they can make it, because that is how science works. After much trial and error the group is able to craft a true diamond.

However, once they realize that the diamond is too small for the medusa, they are outraged when Senku tells them that they will have to mine for real diamonds, with Chelsea stating that a week's walk away from Corn city is Lessen Peak. After relaying this information to Corn city, Senku informs them that this is the last time they will be calling them until the battle with Stanley is over to avoid Stanley picking up on what they are doing. In the meantime, Senku and his crew will travel to Araxá, which is not only home to many rare minerals, but also rocket fuel and it is in Araxá that they will establish Superalloy City.

However, upon hearing about this, Xeno uses his magnified claw to send radio waves to Stanley about where they are going, prompting Stanley to change course and arrive before the Kingdom of Science does. Senku declares that Araxa is not only a stone sanctuary but also where the final battle against Stanley's forces will take place.[9]

Fort Medusa is established.

They build a sizeable defensive fort, as Gen questions why and Senku says that they have to ready for the fight against Stanley. Senku revealed that he noticed Xeno's magnetized claw, realized he must have tampered with the radio signal to alert Stanley to their location, something the latter confirms. This forces them to speed up their plans a little, as Ryusui realizes they needed to lure Stanley regardless to reclaim the Perseus for their future travel. Meanwhile, Tsukasa and Hyoga then have a short conversation while wrapping their wounds about how they think the battle will go, and neither of them are very optimistic. The science group then begin trying out different scenarios of attacking: such as using the petrification devices and throwing them, making tripwires that activate using pre-recorded messages. However, neither cases are very effective due to abilities and chances of misfires. A small group then goes and mines for diamonds to make batteries with, and an underwater water wheel was constructed for use as a sneaky grinder. As it turns out, the construction of the devices is too intricate for Kaseki, and he struggles with prying them open without damaging them. Kaseki says they'll be lucky if they manage to complete even one or two of them.

More attack trials are conducted such as activating it using Ukyo's arrow, however Ukyo's range would be similar to that of the guns'. Taiju then suggests that he simply run over to where the Americans are and activate it with a sort of suicide run since petrification would heal any injuries, but is told not to because a shot to the head would kill him instantly. Chrome, having a stroke of brilliance, says they could simply petrify everyone, and have someone really far away ready to walk back and revive them after the battle is over. As a failsafe, Senku sets up the device so that any member of the Kingdom of Science could activate the device from one of the many microphones set up around the fort, rather than just rely on one person to not get shot.[10]

Fortification construction is still underway at Fort Medusa, and Kaseki still has not succeeded in creating a powered medusa. Gen asks if they can re-insert the same diamond, similar to what Joel did, however the ones the science team has are too old and damaged for it to work.

Back in North America, we see Joel struggling with the same problem that Kaseki is. They both come to the conclusion that there needs to be something else happening in addition to having the correct shape, size and perfection. Senku says that if Joel isn't able to pull it off either, then there must be something wrong. Chrome says he doesn't think the diamonds are the problem, as Kaseki's are "solid as heck", possibly even stronger than the originals. This gives Kaseki an idea, which he tests by cracking several of the diamonds they took out of the devices. All of them split perfectly down the centre.

Senku and Dr. Xeno hypothesize that the lines may be channeling something, as the creases in the diamond follow the cleavage planes. With the new information, Kaseki's vigor is renewed and he continues his work while everyone else rushes to finish the fort. Joel is unaware of this discovery as they are still no-contact.

Suika is chosen as the one to revive everyone after the device is activated as she's skilled at hiding and it'll supposedly be safer. Francois joins Suika to ensure she has a supply of food and fresh water. Together, they travel along the river to see if Stanley's men have found them yet. Sure enough, three canoes full of camouflaged troops disembark on the shores near where Francois and Suika are hidden. Ginro and Matsukaze are with them as hostages. Suika wants to warn the others at Fort Medusa that they're coming, however Francois says wireless communication is a last resort.

Above them, a spider appears and is repulsed by the army ant spray Francois and Suika are wearing. It scuttles away off a leaf and straight onto Charlotte, who is bitten on the neck and falls to the floor. Francois and Suika witness this and, thanks to Senku, know how to potentially save her. Francois hesitates, as helping Charlotte would give away their location, ruining the whole plan. However, Suika jumps to action, by snatching and putting the nitroglycerine-soaked swab onto the bite, bringing Charlotte back to life.

At the same time, Senku and Xeno are having a conversation about Stanley, with Xeno saying how Stanley will not hesitate to slaughter anyone to save his general. He then goes on to say that Senku's "lovely platitudes" reveal his inherent weakness, just like the cleavage planes on the diamonds reveal their weaknesses. At the same time, the American soldiers travel the jungle before Charlotte is bit on the neck by a spider (who was repulsed by the repellent worn by Suika and Francois) and collapses on the ground because of the venom spreading in her system. As she passes out, Francois and Suika watch, pondering if they should save her. However, Suika emerges from hiding, to the shock of Francois. Suika quickly places a nitroglycerine-soaked swab onto the bite, saving her life. Regaining consciousness, Charlotte thanks the young girl. However. the rest of the group are alerted of this and spot Suika standing over Charlotte.[11]

Having been spotted by Stanley's men, Suika finds herself being held at gunpoint with Ginro and Matsukaze bound in rope. The soldiers demand Suika freeze but she, Ginro, and Matsukaze are unaware of what "freeze" means, with Francois noting that because they do not understand this means to not move, they are in trouble. Francois pulls a small paring knife out of their bag, but lacking combat skills, decides to throw it towards Matsukaze and Ginro. Matsukaze reacts immediately thanks to his anti-medusa training and leaps on top of one of the guards to catch the knife midair. Since he can't cut his own rope, he opts to cut Ginro free instead. Ginro has a minor crisis as he's been entrusted with everyone's lives, but pulls himself together enough to grab a long stick from the ground and begin swinging at Stanley's men, hitting several. He feels confident for a moment, apparently remembering that he's "actually kinda strong!" thanks to his village guard training. However, Stanley puts an end to his rebellion by destroying his spear and ties him back down. Stanley then points his gun at Suika, who is cornered. Francois, realizing Stanley had waited until Ginro had attacked before shooting at him, realizes that Stanley is following prisoner of war rules and will not fire against civilians. Francois surrenders, explaining that Suika is a civilian doctor and that they were treating Charlotte's spider bite. In addition, Suika's been living away from the other's for safety's sake. Suika realizes François is protecting them and notes the story is not a lie, exactly. Stanley listens, removing his helmet and says that he won't shoot them if that's true. Francois and Suika are captured and tied similarly to Matsukaze and Ginro. Maya then asks Leonard what he has discovered. From the treetops, Leonard says that Francois sent a transmission that said "we've split into two teams" to Corn City, as a precaution.

Back at Fort Medusa, Kohaku runs in yelling, asking if something happened to Francois and Suika. Senku responds that they had a run-in with Stanley's men. Ryusui asks why Francois would give away their location just to send a message, but Senku says Francois actually gave them the Americans' position. Chelsea calculates their approximate location based on how long it's been since Francois left and the bearing of the signal, giving them the location.

Final Battle

The Kingdom of Science's fighters enter a suicidal charge towards Brody and his armed men. Brody wonders why they're even attempting a frontal assault when it's sure to result in their deaths. It is soon revealed that Senku had indeed order them to attack, to obtain the device and hurry because people were already dying in Araxá.

Realizing their endgame, Brody commands his men to open fire and at no cost allow any members near the weapon. Despite suffering grievous injuries, the Kingdom of Science press on while knowing that being petrified will save them from death. Moz then uses his spear to force a route between the Americans to get to Brody. He successfully cuts the keychain off of Brody's necklace, flinging it upwards. Homura swiftly jumps to action, leaping above everyone else and catching the keys. Brody pulls his shotgun out and blasts Homura's arm, forcing her to drop it. They each scramble for the keys; Kinro nudging Americans out of the way and Kirisame throwing a sharpened rock to stop one of them grabbing it. Magma succeeds in grabbing the keys and makes it to the safe. He quickly opens it, only to get filled with bullets moments later.

The shooting soon tops with all the members of the Kingdom of Science in the room are lying on the floor, covered in blood. Shedding a single tear, Brody looks down in anguish and goes to retrieve the device. This proves to be a mistake as Joel, still alive but crushed by Brody, presses a button on his watch and grabs the device before Brody does. Angered, Brody slams the safe onto Joel's arm, crushing it. Brody asks why Joel would betray the Americans, and Joel responds it was because he'd interrupted his victory toast. Hearing a noise from Joel's watch, Brody realizes that they must have gotten Senku's command somehow and demands they secure the watch's radio. Another American says it's not like they'd be able to activate it given how injured they all are. Joel tells them they're not the ones going to activate it, but Why-man, who has been sending signals at regular intervals to petrify the whole world.

To the horror of Brody and his men, the American Colony castle is then engulfed in the petrification beam.[12]

Last Resort

As the petrification beam was approaching, Gen and the others wondered how long it will take for the beam to approach. Senku stated it was the only way to defeat Stanley. Gen soon remarks on Senku's bad luck if he was to depend on it for a countdown. However, Chrome plans to create a way for everyone to awake without enduring thousands of years, before they are shocked to see Senku shot.

Meanwhile, Ukyo liberates his captive allies from the soldiers and they immediately take down their captors. Francois reports that they have several bottles of revival formula but they are soon gunned down by Stanley. Xeno and Stanley are reunited while planning to use the formula to save themselves until they see that Suika avoided being shot and took the bottles for herself. Suika then reaches the Fort with bottles of revival fluid, before Stanley arrives and Suika drops some bottles. Fortunately, Chrome catches the last bottle and gives it to Gen, the mentalist quickly placed it on the rig to ensure someone is revived. Determined to protect Senku, they impede Stanley from any further attempts on Senku's life, by keeping him at bay.[13]

Story Impact

  • Stanley learns Senku's group is heading for South America.
    • Stanley keeps Ginro and Matsukaze aboard the Perseus.
  • The Perseus has been customized with weapons by Stanley and his unit.
  • It is revealed Xeno is aware of the Why-man and his signal on the moon.
  • It is revealed the Senku was petrified at 12:40pm with Xeno being petrified at 8:25pm
    • Later, it was suspected that the petrification devices speed was around Mach 100 (Calculating distances between San Francisco and Japan and the time when Senku and Xeno got petrified and excluding earth's own speed).
  • It is revealed that there was a 15 minute gap between Xeno and Senku being petrified.
  • It is revealed that it took under an hour for the earth to be completely petrified.
  • Senku plans to create Superalloy City in South America.
  • Chelsea Childe, a geographer is found.
    • Dr. Chelsea is familiar with Dr. Xeno.
    • Chelsea is revealed to have revived three years after Xeno.
    • Chelsea is familiar with Xeno from meeting at the Science Expo thousands of years ago.
    • Chelsea reveals that she overheard Stanley’s order and stayed conscious for thousands of years.
    • Chelsea revived three years after the American Colony.
    • It is revealed Xeno had signs built to help any other Americans find him and the others.
    • Because of her nearsightedness, Chelsea went South instead of north to reunite with the other Americans.
    • Chelsea endured a full year on an island while suffering from nearsightedness.
    • When Chelsea squints her eyes, her face resembles Suika's when she squints without glasses.
    • Chelsea is given a new set of glasses by Senku.
    • Chelsea reveals a way to travel to South America quicker.
  • Because of Chelsea, Senku plans to create a motorcycle.
  • Rubber is re-created.
  • Senku recreates motorcycles.
  • The mobile lab is destroyed by Stanley.
  • The alliance recover the medusa and start to figure out how it works.
  • The Science brigade reaches the Amazon rainforest.
  • Senku recreates manual faxing.
    • Senku has his group in America retrieve the petrification weapon from the lake in order to study its functioning.
    • A new man named Joel is revived and he is able to get the petrification weapon functioning again.
    • Rubber Boots are re-created.
    • Insect repellent is re-created.
  • The Kingdom of Science discovers an enormous pyramid-shaped pile of Petrification Weapons at ground zero in South America.
    • It is revealed that none of the Petrification Weapons were not detected by radar, when the Petrification event took place.
    • Petrification pyramid shown to have non-functioning weapons.
    • Needing to evade Stanley, the science brigade creates a stealth ship it to ensure they are not detected by radar they cover the ship in multiple petrification devices.
    • They used the diamond that they now acquire to test power theory on the petrification weapon.
  • To transverse the rainforest, the Science Group create a stealth ship and coat it with Petrification weapons to avoid detection from radar.
  • In order to establish Math City, the Science Group plan to reclaim the Perseus for travel of Atlantic Ocean.
  • Tsukasa, Hyoga, Kohaku, Taiju, and Ryusui are gunned down by Stanley in the final battle.
  • The members of the Kingdom of Science in corn city are also gun down by the force of Dr. Brody.
  • Joel is able to activate the petrification device and use the signal from Why-man to petrify the whole Earth.
  • Realizing that he was nearly going to lose his people in the final battle, Senku has the Earth petrified in a last ditch effort.
    • Stanley concedes defeat to Senku while knowing his statue will be used as leverage to get Xeno to comply.
  • Senku begins counting again to stay awake.

Characters Introduced


  • During the mobile lab's sendoff, Taiju's pose is a reference to the anime One Piece.
  • Between the visual of Stanley's team jumping off the Perseus, the presence of a desert, and motorcycles, it's possible Boichi was alluding to Mad Max in this chapter.
  • The mobile lab is shown with a tiny halo as it sinks on the map on page 9.
  • Stanley never confirms the state of the Panama Canal.
  • The Atacama desert has spilled over from Peru all the way to the coast, making it an arid region. Chelsea would have expected a humid, subtropical climate if it were still the 21st century.
  • Despite being shown in several chapters previously, this is the first time we learn Charlotte's name.
  • Modern engines should be able to handle sugar water thanks to modern filters, however because the engines used here were primitive, the sugar was extremely effective.
  • Both Maya and Senku reference 'remote work', a nod to something that most of the world was doing at the time of the chapter's publishing due to coronavirus.
  • The name of the 'classy watchmakers' Ryusui knows of is Rodex, a modified version of Rolex.
  • When searching for Joel, Magma disappears and is replaced by Yo and Homura when he gets revived.
  • There is a spelling error on page 14, where Brody and Yo's thoughts say "his while life" rather than "his whole life"
  • There is a full moon shown, putting the current time around mid-December.[14]
  • The map Chelsea makes is of California, from the Bay Area to Sacramento, with the star representing the capital of California.
  • In Chapter 180 it is confirmed that the current year is 5742 and that the date is new years day.
  • As of Chapter 181, it is mid-January so Senku is approximately 20 years old.
  • Stanley and Xeno are seen as kids.
  • Soyuz and the people of Treasure Island return after fifty chapters.
  • For some of the inhabitants of Ishigami Village, it is the first time being petrified.


  1. Dr. Stone Manga: Chapter 170, Pages 1-10
  2. Dr. Stone Manga: Chapter 170, Pages 11-13
  3. Dr. Stone Manga: Chapter 170, Pages 14-19
  4. Dr. Stone Manga: Chapter 171
  5. Dr. Stone Manga: Chapter 172
  6. Dr. Stone Manga: Chapter 173
  7. Dr. Stone Manga: Chapter 180
  8. Dr. Stone Manga: Chapter 181
  9. Dr. Stone Manga: Chapter 183
  10. Dr. Stone Manga: Chapter 184
  11. Dr. Stone Manga: Chapter 185
  12. Dr. Stone Manga: Chapter 191
  13. Dr. Stone Manga: Chapter 192
  14. https://twitter.com/CDCubed/status/1335637035701293056?s=20

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