National Diving School director Jerome Vincent, wearing a Gandolfi space suit, trains in a swimming pool in Marseille October 22, 2014. The underwater test session develops European expertise in spacewalk simulations under partial gravity for exploring the Moon, asteroids and Mars.The training is organised by Comex, a French company specializing in engineering and deep sea diving operations, in collaboration with the European Space Agency (ESA) and with Apollo XI “Under the sea”. (Photo by Jean-Paul Pelissier/Reuters)

Comex Space division manager Peter Weiss checks the Gandolfi space suit before a training session in Marseille October 21, 2014. (Photo by Jean-Paul Pelissier/Reuters)

Comex Space division manager Peter Weiss (L) and Comex project engineer Virginie Taillebot (R) move the Gandolfi space suit before a training session in Marseille October 21, 2014. (Photo by Jean-Paul Pelissier/Reuters)

National Diving School director Jerome Vincent, wearing a Gandolfi space suit, executes training procedures in a swimming pool in Marseille October 22, 2014. (Photo by Jean-Paul Pelissier/Reuters)

The Gandolfi space suit of Comex is seen before a training session in a swimming pool in Marseille October 22, 2014. (Photo by Jean-Paul Pelissier/Reuters)

Comex's astronaut-diver Julien Bonini, wearing a Gandolfi space suit ,executes training procedures in a swimming pool in Marseille October 22, 2014. (Photo by Jean-Paul Pelissier/Reuters)

Comex Space division manager Peter Weiss (L) and Comex project engineer Virginie Taillebot (2ndL) move the Gandolfi space suit before a training session in Marseille October 21, 2014. (Photo by Jean-Paul Pelissier/Reuters)

National Diving School director Jerome Vincent, wearing a Gandolfi space suit, trains in a swimming pool in Marseille October 22, 2014. (Photo by Jean-Paul Pelissier/Reuters)

Comex Space division manager Peter Weiss (L) checks the Gandolfi space suit of National Diving School director Jerome Vincent (R) during a training session in a swimming pool in Marseille October 22, 2014. (Photo by Jean-Paul Pelissier/Reuters)

National Diver School director Jerome Vincent, wearing a Gandolfi space suit, trains in a swimming pool in Marseille October 22, 2014. (Photo by Jean-Paul Pelissier/Reuters)

Comex Space division manager Peter Weiss (R) checks the Gandolfi space suit of National Diving School director Jerome Vincent (C) with Comex's astronaut-diver Julien Bonini (L) during a training session in a swimming pool in Marseille October 22, 2014. (Photo by Jean-Paul Pelissier/Reuters)