submarine, pigboat, sub, U-boat
['upright, upright piano', 'snorkel', 'hippopotamus, hippo, river horse, Hippopotamus amphibius', 'king crab, Alaska crab, Alaskan king crab, Alaska king crab, Paralithodes camtschatica', 'police van, police wagon, paddy wagon, patrol wagon, wagon, black Maria', 'vault', 'maillot, tank suit']