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They work to protect our planet from deadly solar radiation. They visit volcanoes and measure the continents drifting apart. They walk untethered in the unknown abyss and then survive perilous re-entry to the surface. They help NASA look for life on watery alien worlds. Most of all, they prove you don’t have to go to space to have out-of-this-world adventures: These six ocean explorers dive deep into our planet’s mysteries. What they find could unlock the secrets of Earth’s past—or be the key to surviving an uncertain future.

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