Comex research vessel Minibex that housed mission control for the Apollo 11 Under The Sea mission.
ESA astronaut Jean-François Clervoy and ESA astronaut instructor Hervé Stevenin slipped into the roles of Neil Armstrong and Buzz Aldrin for an underwater simulation of the historic mission to the Moon.
Training astronauts underwater is an effective way of getting used to the sensations of working in weightlessness for long periods.