The US Navy Wants Undersea Gas Stations for Underwater Drones

[Tony]

A California company is working on an underwater refueling station that can top off the fuel cells of undersea surveillance drones, allowing the vehicles to venture farther and work longer.

Needless to say, the US Navy is interested in that kind of technology. The sailing branch is even exploring ways to tap sea-bottom thermal vents in order to keep power flowing to underwater gas stations. https://motherboard.vice.com/en_us/article/qvxmv3/the-us-navy-wants-undersea-gas-stations-for-underwater-drones