ESA-selected Mars500 participant Cyrille Fournier plays the drum on an empty container as part of the crew's celebration of cosmonauts' day on 12 April. Fournier is one of six crewmembers to enter a special isolation facility at the Institute of Biomedical Problems (IBMP) in Moscow on 31 March 2009 for a 105-day stay as part of the Mars500 study.