The NEEMO 16 aquanaut crew around the hatch of the Aquarius Reef Base underwater laboratory on Day 1 of their mission (June 11, 2012).  The aquanauts are scheduled to live and work underwater for twelve days on this NASA/NOAA mission.  Clockwise from lower left:  Cornell University astrophysicist <a href="https://en.wikipedia.org/wiki/Steve_Squyres" class="extiw" title="en:Steve Squyres">Steve Squyres</a>, European Space Agency astronaut <a href="https://en.wikipedia.org/wiki/Timothy_Peake" class="extiw" title="en:Timothy Peake">Timothy Peake</a>, NASA astronaut/NEEMO 16 commander <a href="https://en.wikipedia.org/wiki/Dorothy_Metcalf-Lindenburger" class="extiw" title="en:Dorothy Metcalf-Lindenburger">Dorothy Metcalf-Lindenburger</a>, and JAXA astronaut <a href="https://en.wikipedia.org/wiki/Kimiya_Yui" class="extiw" title="en:Kimiya Yui">Kimiya Yui</a>.  Seen through the hatch:  Aquarius habitat technician <a href="https://en.wikipedia.org/wiki/James_Talacek" class="extiw" title="en:James Talacek">James Talacek</a>.  NASA photo in public domain.
NASA/Mark Widick
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