When doing this with an airship the game will freeze, but when done with the submarine on certain versions of the game, the submarine rises out of the water and lets the player move the chocobo itself, with the airship moving behind. This leads to different side-effects, such as game crashing and graphic errors. The only way to make the submarine usable again is to board the airship while on the chocobo with the submarine. The player should then enter the airship with the [MENU] button. After returning to the world map the submarine will be in the place where it was before being boarded.