Whoa! This is a new one. Most people knew about the Underwater Gear. Don't worry though. I'm here to help. You have to find and kill 3 Crab O' the Sea's and get a Conch Shell. Bring 3 of them back to the Shipyard guy (whatever his name is, not important), and he will have the gear available to buy. I think the air tanks cost 3000, and the head gear costs 2000. For every 3 conch shells, he makes 2 sets.
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