Since time immemorial, a rare type of electric catfish known as the Zapfish has been prized by Inkling society as a source of energy. In fact, the entire city of Inkopolis is powered by a single 100-year-old Great Zapfish.
This seems to be an Octarian assault vehicle, but it doesn't appear to have an engine. The big question, then... how does it move? It's frighteningly clear that the source of Octarian power lies outside the ream of established science.
This scroll was found in a deep rock layer, its age estimated at approximately 2,000 years. It details the ancient Turf Wars of the time. It seems the basic four-versus-four battle format has already been established at this stage.
"The Terrifying Biology of the Inkling!"
"Strength: Can leap up to 5 ft." "Brain: Simple and predatory"
"Bones: None!" "Eyes: Can spot prety from 100 yd. away"
"Defense: High-pressure, high-capacity ink sac"
"The Department of Energy has announced that further declines in the availability of electric power are likely to occur in the near future. With the underground domes also deteriorating rapidly, the future does not look bright."
It seems that some Octarians can assume humanoid form. These specimens have superior physical capabilities and are highly aggressive. High-ranking individuals have kelp on their heads. But what motivates them, if anything at all?
With the creatures of the surface driven to extinction by rising sea levels, the ancestors of the Inklings were free to haul their 10-legged bodies up onto the abandoned land. This is how the Mollusc Era began.
The first battles of the Great War ended in victory for the Octarian forces. The diligent Octarians easily dominated the Inklings, who were unable to wake up early enough in the morning to defend themselves.
Heralded by loud explosions, the "Great Octoweapons" quickly stormed the Inklings' central stronghold. Victory for the Octarians seemed all but certain, but due to a plug being carelessly pulled from its socket, their hopes were dashed.
This is the only existing photograph of the legendary Squidbeak Splatoon. The young man folding his arms appears to be the leader. When this picture was taken, the Great Turf War had been raging on for over a year.
Before the Great Turf War, there were amicable relations between the Inklings and the Octarians. They couldn't have dreamed that rising sea levels would force them to battle fiercely over the remaining territory.
"These two cousins from Calamari Country won Inkopolis's first annual Youth Folk-Singing Contest. Their remarkable voices earned them a standing ovation from all present and catapulted them into the spotlight!"
"It's Black Friday every day at the Booyah Base Ultra-Mega-Hyper Sale! Every deal's a doorbuster! If you want to be the FRESHEST squid in Inkopolis, you CANNOT miss this incredible shopportuntiy!"
"Squid Squad's new album, Fresh Kids, takes their trademark squidcore sound to a whole new level! Critics call it 'an aural buffet of squidiosyncratic psychedelicacy!' The perfect theme for any Turf War! On sale now!"
"From the depths of the sea we emerged long ago, seeking the light of the surface. In searching of still greater lights, we now send this message into outer space, sealed in a disk. Perhaps one day, we will encounter other intelligent life.
The customary chorus of Calamari Country.
Nowadays, this song and dance may as well be carved into the very DNA of all Inklings. It began as a way to celebrate and show respect for the bounty of the sea.
"Why are we here? For what purpose do we exist? We must not dwell on these questions. We can merely trust in the will of the universe and spend our days and nights in harmony with the world, celebrating this festival called Life."
"Though academic circles warn of rising sea levels, the policy makers pay them no heed. At this rate, human civilization may be lost beneath the tide. Will even this furry fellow be consumed by the raging ocean?"
A 12,000-year-old fossil of a creature with an odd internal skeleton. Its small skull indicates the creature was likely primitive with little intelligence. This specimen appears to have been fossilized in the middle of some kind of ritual.
"Oh, my beloved Judd... It seems the day has finally come. This capsule is designed to remian cryogenically sealed for 10,000 years. Good-bye, my purrfect little kitty cat. May your meows echo through the ages."
- The "Sunken" part of the Scrolls' name may suggest that some of them contain information from older times, either comparing them to undersea treasure or referencing the bygone human era that was drowned when the sea levels rose many years ago.
- Sunken Scroll #4 suggests that the ancient Inklings' culture were similar to that of ancient Egypt.
- Sunken Scroll #14 hinted to the upcoming Bamboozler weapon.
- In Sunken Scroll #15, a character standing behind Cap'n Cuttlefish may had been Sheldon's ancestor.
- Sunken Scroll #16 shows that Cap'n Cuttlefish and DJ Octavio lived before and through the Great Turf Wars.
- It also suggests that DJ Octavio used to have a humanoid form, before he became an octopus-like being.
- From DJ Octavio's clothing and headgear, it suggests that he and the Octavians' culture might had more East Asian influences (specifically Japanese).
- Sunken Scroll #23 shows a music score of the main melody of the Squid Sisters's song played during the 2nd phase of the final boss.
- Sunken Scroll #26 shows a Wii U Pro Controller tied to a Wii Remote with the buttons L, R, B and down on the D-Pad in red. This is a probably a reference to the fact that in the Battle Dojo, if the player using the TV presses these same buttons on the starting screen, motion controls will become available when using the Pro Controller.
If you flip through all the scrolls while looking at the bottom right corner (where you can see a doodle), it becomes a flip-animation, with a zapfish turning into Judd, and then Judd turning into Sheldon.