A year after the first deaths of divers who ventured into the ocean’s sunless depths, an industry wrestles with new challenges for piloted submersibles and robotic explorers.
A 2003 expedition by a piloted submersible to the wreckage of the Titanic on the sea floor, as documented in the James Cameron film “Ghosts of the Abyss.” A pair of robots are scheduled to revisit the site next month.
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