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The submarine Titan departed at 6am on Sunday with five passengers on board but suddenly went missing 12,000ft below sea level 435 miles south of St John's, Newfoundland, Canada
Understanding what went wrong with the Titan submersible will require careful collection of debris and an investigation that could take months, experts say.
At least 46 people successfully travelled on OceanGate's submersible to the Titanic wreck site in 2021 and 2022, but questions about the vessel's safety were raised by both a former company employee and former passengers.
Two tragedies unfolded at sea within days of one another, but the focus on the search for the Titan, a privately owned and operated submersible that ferried wealthy adventurers to the Titanic, eclipsed that of what could be the worst migrant boat disaster on record in the Mediterranean Sea.
Questions about resources used in search for adventurers and rescue of migrants