Missing Titanic submersible built with NASA help

OceanGate's Titan submersible on an underwater platform prior to a 2018 test dive.

The submersible that went missing with five people on board during a dive to the wreck of the Titanic on Sunday (June 18) was built with NASA's help.

Washington-based company OceanGate consulted engineers at NASA's Marshall Space Flight Center in Alabama during the development of the deep-sea submersible, which is called Titan.