Gentoo is Endurance Energy’s refurbished and upgraded version of its Adélie subsea geothermal test system. Adélie was deployed at Axial Seamount, where Endurance drilled a geothermal well, operated the plant remotely from Seattle over subsea fiber, and briefly generated more electricity than it consumed using heat from a nearby hydrothermal vent. The well produced hot fluid but did not provide enough flow to run the plant. Endurance describes Gentoo as targeting higher power and longer sustained generation.