Portrait of American aerospace engineer and NEEMO 13 aquanaut <a href="https://en.wikipedia.org/wiki/Christopher_E._Gerty" class="extiw" title="en:Christopher E. Gerty">Christopher E. Gerty</a>. From <a rel="nofollow" class="external free" href="http://open.nasa.gov/blog/author/cgerty/">http://open.nasa.gov/blog/author/cgerty/</a>. NASA photo in public domain.
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