Checked in the Editor/Sandbox, Same thing happend even when I did "allowDamage", however it seems like if I drive into the water in fullspeed (around 80km/h) I'll just hover down to the bottom of the water and drive, but if I drive slow (less than 40km/h or so) then I go down as a line and the vehicle destroys itself.

@DarkDruid The video is from a Roleplay mod AKA Street Life, and the second time I tried I did it on the Scenario mission where you have to Steal the armored vehicle

I just re-tested on a scenario mission and the exact same thing happened (I could drive like I could in that vid).