These 30 parts are found underwater around the coast of Los Santos. You'll need a submarine (unlocked through a specific mission) to collect them. Collecting all parts unlocks the 'Death at Sea' mission for Michael, which provides a cash reward. This is a tedious but necessary collectible for 100% completion.
Grand Theft Auto V
Submarine Parts (30)
Locate all 30 Submarine Parts scattered underwater in Grand Theft Auto V. Collect them to unlock the 'Death at Sea' mission and earn cash rewards.
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