There's a hole in the bottom of the sea...

Let's see...
Sharktopus - checked
Mega Shark vs Giant Octopus - checked
Mega Shark vs Crocosaurus - checked
Dinoshark - checked
Malibu Shark Attack - checked
Red Water - checked
Shark Attack 1, 2 and 3 - checked
Shark Hunter - checked
Shark In Venice - checked

Next: Shark Swarm, maybe?