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The view from the port side of R/V Atlantis. Past the bit of land in the background of this photo, the waters got choppier.

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WHOI scientist Al Duester prepares a transponder for launch. The transponder, housed inside a ball of glass, is then covered in a yellow flotation device. We sent out several of these today. They allow us to locate Alvin’s position on the seafloor, by calculating how much time it takes a sound to travel from Alvin to the transponders and back.

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