I'm not saying it's the Deep Ones, but..... Did bioluminescent pyrosomes start the Vietnam War?

Film of a square-rigged ship!

News of the 21st Century: the Navy is synthesizing hagfish slime and contemplating its potential.

“From a tactical standpoint, it would be interesting to have a material that can change the properties of the water at dilute concentrations in a matter of seconds,” Ryan Kincer, a materials engineer at Naval Surface Warfare Center, Panama City Division, said in a statement.

The Navy also envisions using the material in products to protect firefighters and divers, as an anti-shark spray, and as a coating for ships to protect against algae, barnacles and other aquatic life that typically attach to them.