Deployment / Silverfish 2
Vent Interface
Silverfish 2
Silverfish is the first subsea geothermal generator. Deployed twice, first in the Mariana Trough off Guam in October 2025 and then on a 386 C black smoker on the East Pacific Rise in January 2026, it sealed to the vent and ran a steam Rankine cycle designed for 1 kW of electricity.
Two dives taught Endurance more than a year of simulation ever could.
2026
East Pacific Rise, off Central Mexico
Specifications
Power output
1 kW steam Rankine cycle
Architecture
Buoyant power loop plus seafloor vent interface, connected by flexible ducting
Dimensions
3.9 m tall, 0.9 m wide
Mass
400 kg in air, 20 to 40 kg in water
Source fluid measured
386 C at the East Pacific Rise black smoker
