Okay, so I got bored and decided to roam around Vice City.
I went to the film studio and found some loose board near the big water tower.
I then thought...why not turning it into a raft.Surprisingly, it worked.It doesn't sink or disappears.
(https://littlewhiteys.com/proxy.php?request=http%3A%2F%2Fs12.postimg.org%2F6yzs5l2rh%2Fbored.png&hash=055a7b20400534adf4acce24c95062e6934813f7)
After floating there for a minute I tried making the boat move by shooting on it with a Colt, and it was a success.
So then came the ''Gun-powered Raft'' name.