Astronauts preparing for missions 250 miles above on the ISS train underwater at Houston’s Johnson Space Center, which has its own mock-up of the orbiting research facility.
Aug. 27. 2013 Japanese astronaut Takuya Onishi is helped with entry into his Extra Vehicular Activity suit by EVA tech James Lemon on the pool deck inside the Neutral Buoyancy Laboratory at the Lyndon B. Johnson Space Center in Houston. Astronauts training for service on the international space station train underwater at the laboratory, which has a mock-up of the space station. Ricky Carioti/The Washington Post Buy Photo