A series of posts on GTAForums claiming to originate from playtest sessions describes two vehicle classes never before seen in the series: ocean-going cruisers and single-pilot submarines designed around the shallow reefs of the Leonida Keys.
According to the posts, boats are no longer a niche vehicle type but a core traversal system, with storable hulls, upgradeable engines and their own insurance tier. The submarine class is reportedly limited to story missions and treasure-hunting side content, echoing the salvage gameplay teased in Trailer 2's diving shots.
How Credible Is It?
The account behind the leak has no verified track record, and none of the claims can be corroborated against official material. That said, Trailer 2 devoted an unusual amount of screen time to marinas, waterways and dive flags — and Vice City's geography makes an expanded nautical system plausible. Treat this one as unconfirmed until Rockstar says otherwise.