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Topic: Missing Sub

An undated photo shows tourist submersible belongs to OceanGate descents at a sea. Search and rescue operations continue by US Coast Guard in Boston after a tourist submarine bound for the Titanic's wreckage site went missing off the southeastern coast of Canada. (Photo by Ocean Gate / Handout/Anadolu Agency via Getty Images)

Lost Titanic sub imploded: Coast Guard

Nicole Karlis
An undated photo shows tourist submersible belongs to OceanGate begins to descent at a sea. Search and rescue operations continue by US Coast Guard in Boston after a tourist submarine bound for the Titanic's wreckage site went missing off the southeastern coast of Canada. (Ocean Gate / Handout/Anadolu Agency via Getty Images)

Why "Titaniacs" risk it all for a wreck

Nicole Karlis