I was developing this a while back. The alpha of it was called the "A-P Bomb" and was included with my "Bombs" package, however the usage was quite different. Instead of being an underwater-only bomb, the bomb was used instead for strafing, because it exploded on contact and could be used anywhere. It was mostly used on single targets, most often players (The "A-P" stands for Anti-Personnel). It had no real splash damage but a lot of direct damage, making it optimum for sighting a player from long distance, then homing in and taking him out. I never got around to remaking the A-P Bomb.