You can go to the under sea with this mod ! Just Press "DEL" in game and enjoy ! And you can go to the under sea with car, bike, plane or helicopter.
This is my first mod !
Cool!, but there is already a way to get under the sea in San Andreas and be inside a vehicle, go to The San Andreas Sound (name of the area) a little more to the right from the train bridge, and dive, once you see a star, get next to it, (close to the wall) and then CJ will fall underwater, there you can spawn a vehicle, a plane, a helicopter, a bike with a vehicle spawner or just a cheat