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On 18 June 2023, Titan, a submersible operated by OceanGate, went missing in international waters in the North Atlantic Ocean off the coast of Newfoundland, Canada. The submersible was on a tourist expedition to view the wreck of RMS Titanic with five people onboard. Communication was lost with the submersible 1 hour and 45 minutes into its dive to the wreck site; authorities were notified when it did not resurface at its scheduled time later that day. On 22 June, it was presumed that the pressure chamber had imploded during its descent, killing all aboard instantly, after a remotely operated underwater vehicle (ROV) discovered a debris field on the sea floor around 200 meters from the wreck of the Titanic containing parts of the Titan.
https://en.wikipedia.org/wiki/2023_Titan_submersible_incident