The submarine was a vehicle Sly Cooper used in "Treasure in the Depths" of "Tide of Terror." He used it to fend off Raleigh's gang of crabs that tried to stop him from destroying Raleigh's treasure chests.
Description
It is a blue submarine that features a circular, clear-glass window in the front. On the top are two yellow lights and a siren, and on the back is a big propeller. The submarine comes with a turret, which is controlled by pressing 
. Pressing 
allows the user to control it.
Other appearances
The submarine also appears in the Thievius Raccoonus PC game. It is featured in the Tide of Terror minigame, where you must use it to shoot 15 treasure chests before crabs manage to steal 15 of them.