Deep-Sea Seals Deep-Sea Seals is an item. A suit module. Used to make the Mark 37 "Hammerhead" suit.CraftingMade at Stark Table8RRubber Seals×4NPrismarine Crystals×4PNautilus Shell×1Used inMark 37 "Hammerhead" BootsMark 37 "Hammerhead" MaskMark 37 "Hammerhead" PantsMark 37 "Hammerhead" Suit