Alvin is hoisted onto the deck of the research vessel Atlantis in May 2013. The sub was reunited with its tender ship after spending 29 months ashore, undergoing a sweeping overhaul that dramatically enhanced the sub’s capabilities. The new Alvin weighed about 10,000 pounds more than the old one. (Tom Kleindinst/Woods Hole Oceanographic Institution)

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Alvin is hoisted onto the deck of the research vessel Atlantis in May 2013. The sub was reunited with its tender ship after spending 29 months ashore, undergoing a sweeping overhaul that dramatically enhanced the sub’s capabilities. The new Alvin weighed about 10,000 pounds more than the old one. (Tom Kleindinst/Woods Hole Oceanographic Institution)