Why not?

Don't you want your own submarine? I do.

Check out this homemade Russian sub. Great pics.

http://www.odditycentral.com/pics/home-made-submarine.html

They're used to harvest sea cucumbers, which I'm guessing is a culinary delicacy.

Sea cucumbers are very expensive, and the taste is so-so. As the story goes, an emperor did not have offsprings, and his physicians said he should eat those sea cumcumbers in large amounts, and his chefs managed to make some eatable recipes out of this thing, which became a part of the Chinese Imperial Cuisine.