"tourist-submarine"

The submersible 'Titan' vehicle has been missing since June 18 in the North Atlantic, with five people on board.

There were five individuals (One pilot and four passengers) on the submersible and their lives were at risk right now.

As the oxygen level falls, the proportion of carbon dioxide being breathed out by the crew will be rising, with potentially fatal consequences, Ledez noted.

"Additionally, the data from the P-3 aircraft has been shared with our US Navy experts for further analysis which will be considered in future search plans."