Getting scuba gear
You cannot carry scuba gear around like it is an item. When you jump out of either the submarine or Zodiak Boat (Dinghy) into water, you will automatically be wearing the scuba gear. The following are the locations of the submarine and Zodiak Boat (Dinghy):
Submarine: When you purchase the "Sonar Collections Dock" property, there will be a submarine that spawns at that dock which you can use. Additionally, after completing "The Merryweather Heist" (Offshore Option) mission, a submarine will begin spawning at Sandy Shores Airfield. Pick it up using a Cargobob air transport plane (press Right on the D-pad), and then drop it in the ocean where you want to use it.
Zodiak Boat (Dinghy): Go to the west side of Elysian Island to find a Dinghy at the Port of Los Santos. You can find another one by going to Miriam Turner Overpass, and searching next to the barge. There is also one on the southwest side of the Post Op depository.
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