ESA head of spacewalk training and Neutral Buoyancy Facility (NBF) operations Hervé Stevenin is one of four specialist communicators, known as capcoms, assigned to the NEEMO 23 underwater mission. He also leads the team behind ESA's Lunar Evacuation System Assembly (LESA), a world-leading prototype of a device to facilitate the rapid rescue of incapacitated astronauts on the Moon.