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It’s been confirmed that the Titan submersible imploded near the wreck of the Titanic, killing all five passengers. William Kohnen is chairman of the US Marine Technology Society Manned Underwater Vehicles Committee. He tells Newshour that in 2018, he and other engineers wrote a letter to OceanGate's CEO, Stockton Rush, warning of the dangers of using an uncertified craft. (Image: The Titan submersible, Credit: Reuters)