GTA V's ocean has a hard limit — and it teleports you if you break it.
GTA VI Iran
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GTA V's ocean has a hard limit — and it teleports you if you break it.

Players cannot naturally survive below 490 feet in GTA V's ocean and will be crushed. However, using cheats to reach the deepest areas doesn't reveal secrets — instead, the game simply teleports the player back to the surface, suggesting the abyss was never meant to be explored.

Source: Kraken — CC BY-SA

The full story

The Kraken — namesake of the deep, but even this sea monster can't save you from the crush zone.
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The Kraken — namesake of the deep, but even this sea monster can't save you from the crush zone.

Pretty surface, murderous depths — and the game literally refuses to let you find out what's down there.
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Pretty surface, murderous depths — and the game literally refuses to let you find out what's down there.

The Kraken sub looks built for the abyss, but try to push too deep and the game yeets you back to the surface anyway.
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The Kraken sub looks built for the abyss, but try to push too deep and the game yeets you back to the surface anyway.