Caught In the Deep

You're so afraid that you decide to not go above to see what's going on. After a few hours, you finally go up above deck to see what's happening.

You find yourself stepping into a pool of blood. You don't see any of your friends around, by now you think you can figure out what has happened, and a quick look into the water confirms your suspicions, a shark still circling your boat with blood on its teeth.

You're shocked at your friends being slaughtered, and rush to the wheel to get away, but the boat won't move. You go down to check the engine, and find that the whole engine has been bitten off by the shark. You have a panic attack, and realise you are now on your own.

What will you do?