12. Attack of the Killer Dolphins

During the ‘60s, the Soviet Union added dolphins to its army. They were reportedly trained to plant explosives on enemy ships, attack divers with harpoons attached to their backs, and drag enemy divers to the surface.

The dolphins were trained to distinguish between enemy ships and friendlys by the sound of the vessels’ propellers and engines.

Photo from Google

Following the collapse of the Soviet Union, former satellite states sold their amphibious platoons to other countries. The Ukraine sold 27 mammals including dolphins to Iran in 2000. It’s unclear what became of these creatures.