I'm sure this has been reported, I've yet to be able to recreate it yet sadly.
Me and a friend were playing GTA3.
Screwing around, flying the tank trying to find the ghost town. We see a big...hole in the ocean. It was a hole that lead to blue hell apparently, I start to lose altitude and I crash land into the hole, I am now 4-5 minutes into the sky.
I fell and fell and fell and fell and fell until finnaly hitting the ground just near the blocked off tunnel