The world is going to end tomorrow as the Alian shark-ships have launched a discrete mission to destroy the earth. To do this, they need to get to the under-water core of the Earth.
The only way to stop this evil plan is to drive the submarine which is carrying the a bomb to kill all aliens in one go. The submarine is on its way but it is attacked by the shark-ships, missiles and torpedoes designed especially to destroy the submarine. Want to save the world? Help the submarine get to its destination and fight against the evil Alian shark-ships