Hagfish: The Original Propeller FoulantHow a bizarre sea creature inspired the U.S. Navy.

From the show

Nature Solved It First

Nature devised a gill-clogging slime so effective, the U.S. Navy is copying it to stop enemy boats. Hagfish secrete a gel that expands immensely in seawater, creating a non-lethal defense against predators. This same principle is now being developed as a synthetic tool to rapidly disable boat propellers without causing lethal harm, offering a new solution for maritime security.