Deep-sea explorer G. Michael Harris has been down to the wreck of the Titanic 14 times. He begged his friend PH Nargeolet not to get on the OceanGate Titan submersible before it imploded in the sea earlier this week. He explains why he saw this coming.

This episode was produced by Amanda Lewellyn and edited by Amina Al-Sadi. It was engineered by Michael Raphael and fact-checked by Laura Bullard and hosted by Noel King.

Transcript at vox.com/todayexplained

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