In the deep sea, nine coated ships floated around Impel Down.
At the bow of the Going Merry, the main cannon beneath the sheep's head extended section by section through the transparent coating, its muzzle aimed directly at the wall below.
"Cola fully loaded. Cannon fire countdown begins!"
Inside the cramped control room, Franky grinned, his trembling hand hovering over a red button on the console.
This was the debut of his prized weapon. He could not suppress his excitement!
"Three."
"Two."
"One, fire!!"
Click!
With a shout, he slammed his palm down on the launch button!
The power system in the ship's lower deck rapidly activated, forcing a massive amount of gaseous energy into the cannon!
As the violent energy gathered and built up, the cannon muzzle outside seemed ready to burst apart!
Boom!!!
A powerful blast erupted instantly! The seawater in its path was churned into a violent current as it tore through the water and blasted a hole through Impel Down's thick wall!
"SU--PER!!"
Franky shouted excitedly, smashing his thick arms together above his head. "The opening is less than ten meters wide. Impel Down really is something else, but it's enough."
As he spoke, he performed another series of operations. A hatch opened along the ship's side, pushing out a shark-shaped submarine through the coating.
"A submarine... I feel scared."
Brook sat inside the Shark Submerge's control room, looking around uneasily.
Carefully operating it, he followed the seawater flooding into Impel Down while comforting himself.
"But to rescue everyone, I will overcome the fear in my heart! Though I'm a skeleton and don't have a heart! Yohohoho~~."
Inside Impel Down, on the sixth underground level, Infinite Hell.
The dim prison shook violently as if struck by an earthquake. The wall suddenly exploded apart, and countless chunks