Need an actual submarine that will go up adn down in water! not in a bottle!! hellp?

Question

it like needs to go down in a big fish tank! adn back up!

i really dn't know how to make it!!?!?!?

ahhhhhh!

heeelllppp!

Answer 1

This sounds like a gimmick to provide interest in tank aeration. Probably need to check with the Aquarium folks.

Answer 2

Sorry about your luck, but really there isn't a small working submarine that'll do it for you.

(Depending on how much money you have, you could have someone design one for you!)