Time ran out for the passengers on the Titan submersible on Thursday morning, according to estimates from officials.

According to the U.S. Coast Guard, the oxygen supply on the submersible which aimed to see the wreckage of the Titanic would evaporate fully at roughly 7:08 a.m. EST Thursday. 

“We have to retain hope as part of what we are doing as a human community to find the explorers and bring them to safety,” Joyce Murray, Canada’s minister of Fisheries, Oceans, and the Canadian Coast Guard said.

There were experts who cautioned against a premature determination of the exact time the oxygen would be completely depleted. Dr. Simon Boxall, who teaches oceanography at England’s University of Southampton, told NBC News, “There are so many variables. We have no idea how long they will actually last in terms of oxygen — all that we know is that it’s imminent.” 

Boxall explained that the passengers on board could start to suffer hypothermia, adding that could mean “they’re using a lot less oxygen,” although that could present other dangers.

Nikolas Xiros, professor of naval architecture and marine engineering at the University of New Orleans, said it was likely the sub had lost power, warning that the temperatures inside could be at the freezing point. “If a lack of oxygen doesn’t get them, what’s going to get them is going to be hypothermia,” he told USA Today.

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Meanwhile, two new vessels, the Canadian CGS Ann Harvey and the Motor Vessel Horizon Arctic, arrived at the area around where the sub went missing. Petty Officer Ryan Noel said rescuers were attempting to get “one of the newer ROVs onsite down there.”

If the rescue for the passengers is only hours too late, recriminations may follow. OceanGate Expeditions, the company responsible for the Titan, reportedly took eight hours to alert the Coast Guard that they had lost contact with the submersible on Sunday. The sub lies roughly 400 miles southeast of St. John’s, Newfoundland.

The sub had been in contact with the mothership, the Polar Prince when it started its dive at 8 a.m. Sunday morning, but lost contact at 9:45 a.m. The Daily Mail reported that the sub wasn’t reported missing to the U.S. Coast Guard until 5:40 p.m., eight hours later, and Canada’s Coast Guard wasn’t alerted until 9:13 p.m. on Sunday night. 

Former President Donald Trump learned on Wednesday who is going to testify against him in the federal case involving his handling of classified national defense information.

The revelation came after the Department of Justice said that it turned over “grand jury testimony of witnesses who will testify for the government at the trial of this case” as part of the discovery process.

JUST IN: DOJ says it has made its first production of trial discovery to Donald Trump and his team — which means (per the below) he now knows who’s going to testify against him, and roughly what they’re going to say. pic.twitter.com/9XgeHplMAE

— Kyle Cheney (@kyledcheney) June 22, 2023

No further information was released about who the witnesses are or what they said during their testimony.

A federal judge issued a protective order on Monday blocking Trump from being able to release any of the evidence that prosecutors turn over to his defense team during the discovery process.

“The Discovery Materials, along with any information derived therefrom, shall not be disclosed to the public or the news media, or disseminated on any news or social media platform, without prior notice to and consent of the United States or approval of the Court,” Federal Magistrate Judge Bruce Reinhart said in the order.

The order said that Trump and his team also cannot disclose any of the material, due to the sensitivity of its contents, in “any public filing or in open court without notice to, and agreement from, the United States, or prior approval from the Court.”

The order said that all the documents must stay in the custody of the defense counsel in a secure manner and that all the material must be returned to the U.S. government or completely destroyed within 90 days of the case being brought to a conclusion.

The defendants are not allowed to retain any copies of the material, but they are allowed to take notes on the material, though that material must be securely stored.