Titanic sub search fears over oxygen levels

Based on past calculations, the sub might only have a little amount of oxygen left if it is still operational and intact.
With enough oxygen for its five crew for four days, it vanished on Sunday in a desolate area of the North Atlantic. And on Thursday, there were still many unanswered questions about how it could be found.
The private company OceanGate Expeditions owned and operated the minivan-sized submersible, but it has not yet been found. If it is discovered, it will need to be accessed with sophisticated rescue tools before being taken to the surface in a process that will probably take hours.
Before the oxygen supply runs out, that would need to occur without harming the ship’s construction or putting the lives of everyone on board in jeopardy.
The US Coast Guard stated that the operation is still a rescue mission despite the fact that the status of the vessel and its five crew members is unclear. According to Captain Jamie Frederick, this is a search and rescue mission, 100%.
After officials reported that Canadian search planes had picked up undersea noises on Tuesday and Wednesday, there seemed to be some hope.
However, the nature of these remains unknown, and officials claimed they might not have originated from the submersible. ROVs (remotely operated underwater vehicles) were sent to the location where the sounds were heard, but they have not yet returned with any results.
Early on Thursday morning, one of the ROVs, which was sent out from the Canadian ship Horizon Arctic, arrived at the ocean floor. Later in the day, more of the multi-national support was anticipated to arrive at the location.
The Atalante, a French research vessel, also arrived in the region on Thursday morning and sent out its own ROV, according to the US Coast Guard. That robot has expertise surveying the Titanic and is capable of learning about the depths beneath the remains of the Titanic, which is located roughly 12,500 feet (3,810 meters) below the surface.
About 26,000 square kilometers (10,000 square miles) of sea are being swept, which is twice the size of the US state of Connecticut. According to experts, the region is prone to bad weather and low visibility, which complicates search activities.
British entrepreneur Hamish Harding, British-Pakistani entrepreneur Shahzada Dawood and his son Suleman, former French naval diver Paul-Henry Nargeolet, and CEO of OceanGate, which operates the submersible, Stockton Rush are all present on board the 21-foot vehicle.
“We don’t know the rate of oxygen consumption per occupant on the sub, which makes it difficult to anticipate how much oxygen is remaining,” US Coast Guard Rear Admiral John Mauger said.
According to Dr. Ken LeDez, a specialist in hyperbaric medicine at Memorial University in St. John’s, Newfoundland, the crew may be able to survive even when oxygen supplies are depleted, depending on their physical condition and the conditions inside the submersible.
While it is hard to know the exact conditions inside, according to Dr. LeDez, the crew will likely experience rising carbon dioxide levels as well as perhaps experiencing frigid temperatures in addition to the dropping oxygen levels.
Hypothermia and loss of consciousness could result from a confluence of these variables, he warned. The fact that their metabolisms are slowing down as a result of the cold might actually help them survive longer, he continued, as these conditions aren’t always fatal.
“They’re incredibly intelligent, successful people in there,”  he remarked.  “In it,if anybody can survive, it’s these people.”