not having to provide a pressurized for people.
of course something on board still need to be in a pressurized space, depending on how deep the vehicle goes.
https://www.maritime-executive.com/article/darpa-unveils-manta-ray-uncrewed-extended-duration-undersea-vessel
Borrowing a page from 1960s science fiction programming, officials at DARPA (the U.S. Defense Advanced Research Projects Agency) released the first pictures of Manta Ray, an in-development extended duration uncrewed undersea vehicle (UUV). They confirmed that contractor Northrop Grumman completed full-scale, in-water testing in February and March and that further testing is continuing on an energy harvesting system developed by PacMar Technologies.
The government confirmed the program had begun in 2020 and at the end of 2021 awarded Phase 2 contracts to perform subsystem testing followed by fabrication and in-water demonstrations of full-scale integrated vehicles.
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