Hunt down enemy ships while navigating your Attack Submarine through treacherous minefields. Sink the ships on their first pass or they will come back and hunt you down.
Like the diesel subs of World War II you must surface frequently to resupply your air and torpedoes, but surfacing isn’t a sure thing.
Increase your sub’s strength by collecting coins along the way, and maybe you’ll survive a depth charge.
How long can you last?