One of the largest nuclear weapons stockpiles in the world is partially defended by trained dolphins

Yes, you read that right. A U.S. Navy base located off the coast of Seattle - which just so happens to be one of the biggest nuclear weapon stockpiles in the world - is partially protected by a few groups of trained dolphins. Trained by the U.S. Navy, these dolphins use their sonar to detect potential invaders, and the devices attached to them allow the Navy to basically see - using sonar - what the dolphins themselves see.