Submersible pilots from the UK-led Nekton Mission converse after one of their craft was forced to conduct an emergency ascent from 250 meters beneath the surface of the Indian ocean off the Seychelles, Tuesday March 19, 2019. A British scientist and her American pilot were inside the submersible when it filled with smoke. Both are now safe onboard the mother ship where an electrical fire aboard the sub is being investigated as the possible cause. (AP Photo/David Keyton)
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