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KENNEDY SPACE CENTER, FLA. - Onboard the dive boat, members of the NASA Extreme Environment Mission Operations 6 (NEEMO-6) mission don dive suits. From left are Tara Ruttley, a biomedical engineer, and astronauts Nick Patrick and Doug Wheelock. John Herrington is mission commander. The NEEMO-6 mission involves exposing an astronaut/scientist crew to a real mission experience in an extreme environment - the NOAA undersea station Aquarius offshore from Key Largo - to prepare for future space flight. Spacewalk-like diving excursions and field-tests on a variety of biomedical equipment are de…