They spent 28 days under the sea—and found another Earth

On the floor of the Mediterranean, Laurent Ballesta and three other explorers discovered amazing sea life, and signs of our impact on a mysterious landscape.

A diving bell carried the author’s team to the seafloor every day from their pressurized capsule on a floating barge. Off Cassis, France, 223 feet down, a forkbeard noses around a reef built by coralline algae.
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