With the completion of the new Alvin, the Woods Hole Oceanographic Institute’s storied deep-sea submersible, 50 million square miles of previously inaccessible seafloor real estate is now open to scientific investigation. Before its upgrades, Alvin was rated to dive to 15,000 feet, but a new titanium personnel sphere means it can now dive as deep as 21,000 feet—and that depth rating opens up 98 percent of the seafloor to Alvin’s robotic fingertips.
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