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Bruce Strickrott, supervising today�s launch, positions the catwalk for loading people inside Alvin. The submersible is 23 feet (7 meters) long, but its 6-foot (2-meter) diameter sphere is large enough for only the pilot and two passengers.

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Seaman Mike Mulkern helps recover the RatCam, which was named by an Alvin pilot who thinks it resembles a rodent. While at Rosebud it took a digital photograph every six minutes to record changes in the community of mussels. (Photo by Amy Nevala)

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