Submersible pilot Randy Holt and Stockton Rush, CEO and co-founder of OceanGate, dive in the company's Antipodes submersible off the Florida coast in 2013. Rescuers are racing to find a missing OceanGate submersible before the oxygen supply runs out for five people, including Rush, who were on a mission to document the wreckage of the Titanic. (AP)
