Ambush! The Navy’s New Hammerhead Mine is a Submarine Killer

Popular Mechanics – The U.S. Navy is developing a new sea mine to make the lives of enemy submarines in wartime a lot trickier. The new Hammerhead mine is designed to lie in wait on the seabed floor, listening for the telltale signs of enemy submarines. Once a foe passes over, Hammerhead unleashes a homing torpedo that hunts down and destroys the offending sub.

(Thanks to Alain)