So here's my top ten aquatic horror movies that aren't Jaws. I left off Jaws because it's classic in it's own right.
If you're Peter Benchley how do you make sharks scarier? You give them arms and legs and have them chase Craig T. Nelson and Kim Cattrall.
Another Peter Benchley entry, this one has William Peterson doing battle with a giant squid. Originally a made for TV mini series, it's been edited down to movie length for some DVD versions.
8. Ghost Ship
5. Shark Night
4. Deep Rising
2. The Deep Blue Sea