Scuba diving is an activity in Grand Theft Auto V. It can be performed anytime by the player, it can be used to get to hidden items in shipwrecks and other places underwater. Each individual character has his own lung capacity however if it's too low then with the use of scuba suit the player will have an oxygen tank. Many of the shipwrecks contain hidden treasure - usually around $25,000.
Some boats, including the Dinghy, are equipped with scuba diving equipment.
Despite having a steady supply of oxygen, scuba diving increases the lung capactiy.