: Find a Nagasaki Dinghy (the black rubber inflatable boat). When you exit the driver's seat of a Dinghy while in deep water, your character will automatically be wearing a full scuba tank and mask.
: If you own the Kosatka submarine , the black scuba outfit is unlocked for free. where to buy scuba gear in gta 5
: Exiting the yellow submarine or the Kraken will also automatically equip the breathing gear. : Find a Nagasaki Dinghy (the black rubber inflatable boat)