Shark Submerge III

The Shark Submerge III is a deep-sea exploring submarine shaped as a shark that can carry three people. It is a part of the Thousand Sunny's Soldier Dock System and can be deployed by the number 3 channel.

Ship Design and Appearance
The Shark Submerge is a small three man submarine shaped like a shark. It was built by Franky in order to aid the Straw Hats whenever they would come to a situation that requires a submarine. It is a simply to use sub that is capable for such a situation. It also has a Den Den Mushi so that members of the Straw Hat crew that are using it can keep in touch with the rest onboard the Thousand Sunny. Though the Shark Submerge is a reliable tool for exploring underwater depths, it however has a diving limit of 5000 meters. Going below any further than that would cause the sub to crack due to the surrounding water pressure.

Anime and Manga Differences
Originally in the manga, the Shark Submerge was first shown when the Straw Hats when Franky explained about the Soldier Dock System in Thriller Bark. While shown, however, it wasn't until the crew reached the second half of the Red Line that the submarine was seen being used to look for Fishman Island. In the anime, the Shark Submerge was first shown and used during the Ice Hunter Arc.