The now-missing CEO of OceanGate who is aboard the missing submersible that travelled to see the Titanic once spoke poignantly about the "challenges" the company faced - and admitted he had no idea how hard it would be,
Stockton Rush, the 61-year-old CEO of OceanGate Expeditions, is missing along with British billionaire Hamish Harding, French Titanic expert Paul-Henry Nargeolet and Shahzada Dawood, a UK-based board member of the Prince's Trust charity, along with his son Sulaiman Dawood.
The vessel had not been heard from since early Sunday morning, and officials fear those on board now have less than 20 hours of oxygen left.