The US Coast Guard has revealed just how long those on board the submersible lost in the Atlantic have left in terms of their oxygen supplies, and it's a terrifying prospect.
Speaking at a press conference, Captain Jamie Frederick of the US Coast Guard First District said that the original 96 hours of oxygen supply was an estimate from data they have on the OceanGate Expeditions submersible.
Heartbreakingly, he estimated the sub will have gone through more than half its oxygen supply.