South America Arc

South America Arc
Arc Info
Saga	The Truth Of The Petrification Saga
Manga	Chapter 170 - 193
Anime	TBA
Arc Guide
Previous	← New America City Arc
Next	New Stone World Arc →

The South America Arc is the eleventh story arc of Dr. Stone as well as the 2nd story arc in the truth about the Petrification Saga.

After escaping Stanley Snyder and establishing a alliance between Dr. Xeno's forces and the Kingdom of Science, Senku and his remaining allies; consisting of Tsukasa, Hyoga, Gen, Chrome, Suika, Ukyo, Ryusui, Taiju, Francois, Kaseki and Kohaku venture to Brazil in South America, along with Dr. Xeno, Luna, Carlos and Max, in order to find out the origin of the original Petrification and also to gather the super alloy for the space ship, while Stanley is in hot pursuit.

Summary

Pursuit to South America

After escaping Stanley's grasps, Gen is shocked to learn that they will be pursued by him to South America, along with several others, in order to retrieve Dr. Xeno. As Uyko and Suika question how they will manage to escape them, Senku remains optimistic as they continue on down river.

On the mainland, as Stanley's group are modifying the Perseus to be used in the pursuit, Matsukaze is taken aboard after sustaining injuries during the attack. Determined to find Ginro, Matsukaze ignores his injuries and finds Ginro cowering away behind the prison cage. Matsukaze takes this to mean that Ginro was spying on the enemy, which he brushes of as that being the case. As Matsukaze collapse, Ginro hides once again.

Some time later, Matsukaze is interrogated by Stanley who threatens to kill him if he doesn't tell him where Senku is. Ginro, unable to see Matsukaze suffer, comes clean to them before apologizing on selling out everyone.

Aboard Xeno's Yacht, he reveals that he is aware of the Whyman and the signal coming from the moon which surprises everyone. However, Senku gets excited as Xeno hopes that they can work together to figure out the course of the petrification and they proceed to exchange information.

After Xeno listen's the Bakyua's message to Senku, they both work together to figure out the methond behind the peterfication, using bubbles and timezones, they also pinpoint the location of ground zero for the original peterfication, which is located in the amazon.

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 sickniss 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.

With Chelsea on board, they update Chelsea is on the recent events such as the Whyman, 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.

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

On San Francisco, Yuzuriha revives Joel that has just petrified himself once he finish fixing Medusa and testing it. 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 was out of juice.

Arrived at the stopping point, Chelsea identifies Andes Range, or Mt. Tenno from Senku's gang. She also identify the snow on Japan, much to Chrome surprises and Hyoga's acknowledgement due to La Nina's effect.

Chelsea bluntly asks Luna's weight, much to her embarrassment. She notice her crush on Senku, but realizes that Senku accept her proposal due to "political" purposes, she felt disheartened, much to her chagrin while Kohaku was already aware of it from the beginning.

Senku and the gang invent scale to measure their weight. The main purpose the cyclist reconfiguration is to maintain the balance and power of the motorcycle during climbing uphill.

The crew start to measure their height and weight, and once the measurements is completed, the gang sets out once more to scale Andes Range, or known as South American's Mt. Tenno. to reach the Amazon Forest.

In the meantime, Stanley and his gang manages to repair the aircraft and settle out to pursuit Senku once more as he knows how to block the exit.

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 replent 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 whyman might anticipate this and create multiple pre planned attacks with the peterfication device.

After a while the crew start trecking on foot to the source of the peterfication, 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.

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.

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 anyway, 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 trail 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 outrage 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 telling 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 Araxa, which is not only homed to many rare minerals, but also rocket fuel and it is in Araxa 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.

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 medusas 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.

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 vigour 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.

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 Whyman 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 allience 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 repelent 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 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 Whyman 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.
• Senku begins counting again to stay awake.

Characters Introduced

• Chelsea Childe
• Joel
• Leonard Maxwell

Trivia

• 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.
• 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.