UDT 2026: Euroatlas testing Greyshark Foxtrot in water, says AUVs could cover Hormuz in 24 hours

Euroatlas' Foxtrot hyrogen powered AUV at the start of in-water testing off the German coast in April 2026. (Euroatlas)

German unmanned maritime systems maker Euroatlas has told Janes that the hydrogen powered Foxtrot version of its Greyshark autonomous underwater vehicle (AUV) has started testing “in the water”.

Greyshark Foxtrot

Verineia Codrean, head of strategy and partnerships at Euroatlas, told Janes at Clarion Defence's Undersea Defence Technology (UDT) 2026 exhibition, held in London from 14-16 April 2026, that Greyshark Foxtrot started its first in water testing on the week of 6 April off Damp near Kiel. Testing continued with the Seabed Security Experimentation Centre (SeaSEC) off Rostock in Germany, in the week starting 13 April, she added.

Euroatlas is testing the hydrogen powered endurance of Greyshark Foxtrot, which Codrean said is 16 weeks, or 8,000 n miles at four kt. Operating constantly at its maximum speed of 10 kt its endurance drops to six days, she added.

Codrean said the in-water testing was a milestone because, at technology readiness level (TRL) four, Foxtrot's propulsion and systems had until that point only been tested on land. Foxtrot can operate down to 4000 m, according to Euroatlas.

Thiago Camargo, chief technology officer at Euroatlas, said that a recirculation pump used to maintain the Foxtrot's fuel mix does make noise. It is, he added, not much louder than the Bravo's electric system, but they are discussing if the pump gives the AUV a detectable signature and depending on what of its various states it is working in. “So far it's not been a problem,” Camargo said.