What looks like a ball turret, sounds like a bicycle, bounces like a pinball, has no energy signature, makes a great cat toy for Cheetor, and plays 1920s carnival music t'boot? It's a subaquatic stealth vessel, or a submarine in plain language. Blackarachnia built it, but it was poor Rattrap who had to operate it. It features a single propeller driven by a hand crank, an external manipulator arm, floodlights (also powered by the hand crank), and a radar system and proximity alert. It's not very large; apart from Blackarachnia, only Rattrap could fit inside, and it was a stretch for him.