As long as Area 5.1 is present in the city, it will be unlocked; it does not matter whether or not the compound is near water. It functions similarly to a submarine (unavailable in the game), being that it travels slightly underwater. The depth that you travel in cannot be raised nor lowered, which limits you to only normal vehicular movement.
- Although the watercraft is technically underwater, you will still sink if you collide with other sea vessels.
- As the "whale" travels, you will hear metallic sounds coming from it. This is the only vehicle in the game which emits this sound.