An autonomous underwater vehicle called Manta Ray has been made by Northrop Grumman. Don't know much about it but it looks dramatic and the company advertises its ability to anchor to the seafloor and hibernate in a low-power state.
An autonomous underwater vehicle called Manta Ray has been made by Northrop Grumman. Don't know much about it but it looks dramatic and the company advertises its ability to anchor to the seafloor and hibernate in a low-power state.