Patrick Lahey, co-founder of an OceanGate competitor, tells a US Coast Guard hearing about his concerns over the Titan sub.

Witness reveals concerns that the submersible’s hull may have cracked during a previous expedition - A third witness is ...

Last year, five people hoping to view the Titanic wreckage died when their submersible imploded in the Atlantic Ocean.

"There was a malfunction in the platform and that took considerable time to correct, and thus the dive was aborted," Steven ...

The passenger testified that the mission was scrapped because the sub couldn't navigate, and was swimming in circles.