After 12 hours, we saw it coming up in small pieces," says Shank, adding that the loss of Nereus made them rethink how they explore the deep sea. About the size of a quad bike and weighing around 550 pounds (250kg), Orpheus is designed to be much lighter, smaller and cheaper than previous underwater vehicles. This should make it nimbler too, allowing it to get into trenches and vents in the sea floor that have never been explored before.

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