The Navy's New Drone Looks and Swims Like a Shark

This is the GhostSwimmer, a new drone developed for the US Navy. It's 5 feet long and designed to resemble a shark. It swims like one, too! It flips its tail back and forth, like a shark, to navigate waters between 10 inches and 300 feet deep.
An operator can use a 500-foot tether to control it, or command it to surface periodically to receive new instructions. The Navy hopes to use it for reconnaissance and ship inspection.
Hopefully future models will include features of the EATR, a robot that could, hypothetically, feed off human flesh. Because that would, I suspect, extend its range.