DeepTrouble

DeepTrouble is a fast paced 3D submarine action game. Earth is covered with
water and aliens are living on the ocean floor. Their constructions are
contamining the water and your mission is to stop it. By controlling your
small submarine you will have to locate alien bases and blow up all
constructions and fleets. Before you can destroy any actual constructions you
will need to take care of energy generators which keeps the construction
shields up. There are ten levels of increasing difficulty and throughout your
missions you can find more energy, shield and better weapons that will help
you to stay alive.