Really?
There is a lot of competition in this "space" (sorry).
Some can do 5000km tours undersea with a few surfacing events to communicate or reset their inertial nav. Off the shelf, today. Powered by hydrogen fuel cells. No, I don't have any connection with cellula.com but they used to be nearby.
Looks like another military-industrial-national-pride-techno-powered-fiscal-farce (*). Glad I'm not a taxpayer in that country.
(*) Not to pick on the Americans: every country has their military-subsidy-complex.