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              <span class="nav-subhead">Expedition 6:<br />
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          <p><span class="heading">No back-seat driving, please.</span><br />
              <span class="date">June 2, 2002</span><br />
              <span class="main-scientist">by Lonny Lippsett </span></p>
          <p><span class="main">&#147;OK,
                let&#146;s see what the hound found,&#148; said Dana Yoerger.
                He was up in <i>Atlantis&#146;</i> Top Lab, about 35 feet above
                deck, where <i>Alvin</i> Pilot Bruce Strickrott was tracking
                the submersible&#146;s movements 1,660 m below the ocean surface.
                Overnight, <i>ABE, </i>the Autonomous Benthic Explorer, had scouted
                out a section of the seafloor and sniffed out a small area with
                possibly warm ocean-bottom waters&#151;a sign of active hydrothermal
            venting. <i>Alvin</i> headed toward the spot.</span></p>
          <p><span class="main">Bruce
                and Dana stared at the sonar that marked <i>Alvin&#146;s</i> position.
                The room was mostly silent, except for the occasional &#147;clicks&#148; of
            the echoing sonar.</span></p>
          <p><span class="main">&#147;He&#146;s heading east,&#148; Dana said, and waited. Several minutes passed. &#147;He&#146;s
  slowed down,&#148; he said. More minutes passed in silence. &#147;Say something,&#148; Dana
  said.</span></p>
          <p><span class="main">But you don&#146;t chat with <i>Alvin</i> Pilots
              at work on the seafloor. In fact, you do not talk with them at
              all unless it is truly important. Driving <i>Alvin</i>&#151;in
    the dark, on a jumbled volcanic seafloor, in strong currents such as today&#146;s&#151;requires
    complete focus. Distractions are strongly discouraged. No matter how tempting
    it is, back-seat driving from <i>Atlantis</i> is definitely NOT welcome.
    No one on deck can know all the things the Pilots may be dealing with on
    the seafloor.</span></p>
          <p><span class="main">&#147;We&#146;re basing our decisions on what we can actually see out the viewports&#151;things
      people on the surface cannot see,&#148; said today&#146;s Pilot, BLee Williams. &#147;And
      the scientists also have a mission and a train of thought that should not be
      broken.&#148;</span></p>
          <p><span class="main">While some of us paced on deck, <i>Alvin</i> was
              following a seafloor fissure several feet wide. The sub came upon
              a large field of dead worms, called serpulids, and heaps of dead
            mussel shells.</span></p>
          <p><span class="main">And then two brown spires rose from the seafloor&#151;1 m and 2 m high. Clusters
          of dead mussel shells fanned out from the base of the spires. They were vent
          chimneys, but they were extinct. Here, for the first time, was evidence of high-temperature
          hydrothermal venting on the Gal&aacute;pagos Rift. Since vents were first discovered
          25 years ago here, the highest temperature venting ever recorded on the Gal&aacute;pagos
          Rift was just the other day at the &#147;Rosebud&#148; vent site&#151;22.5&deg;C
          (72.5&deg;F).</span></p>
         
          <p><span class="main">BLee sampled a piece of the extinct chimney and
              brought it up. It was speckled with shiny crystals of metal sulfides.
            These only form when vent fluid temperatures reach 200&deg;C (392&deg;F), Susan Humphris said.</span></p>
          <div class="learn-cell">
<p class="learn-more"><strong>National Public Radio broadcast from <em>Atlantis</em>, June 1, 2002</strong></p>
<p class="learn-more"><a href="http://www.npr.org/ramfiles/wesat/20020601.wesat.04.ram" target="_blank">National Public Radio - Audio Download</a> <span class="style9">- An interview on the Weekend Edition of National Public Radio with Scott Simon. He interviews co-chief scientist Tim Shank on <i>Atlantis</i> and Susan Humphris one mile below the surface in <i>Alvin.<br />
<br />
</i> (You will need Real Audio Player to listen to this 5 minute interview.)</span></p>
</div>
<p><span class="main">&#147;We have one last dive,&#148; Tim said this evening. <i>ABE,</i> the
              CTD, and our deep-sea camera will spend the night searching for
              more leads of active venting. If they find something, we will search
              for an active black-smoker chimney gushing particle-laden fluids
              into the ocean. If they don&#146;t, we will return
            to the lush new vent site we discovered yesterday.</span></p>
          <p>&nbsp;</p>
<p align="right"><span class="glossary">[<a href="#top">Back to top</a>]</span> </p>
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