Titanic sub: What could have caused the implosion of the vessel?

With no certification from any regulatory body
and a history of system malfunctions, questions
Linger ouer the Titan tourist submersible's
safety conditions and its deadly implosion.
The debris of the sub was discovered by the
U.S. Coast Guard, confirming the deaths of the
five people on board.
Eric Sorensen speaks with industry experts
about whoat could have gone wrong, and the
Criticism towards OceanGate Expeditions, the
company that built the vessel.