The U.S. Coast Guard has revealed that there are about 40 hours of air left to sustain life on the submersible, and is rushing to search for it along with the Canadian Armed Forces and others.
The submersible, which went to see the British luxury liner Titanic, which sank after colliding with an iceberg, departed from eastern Canada and lost contact after diving into the sea on the morning of the 18th.
Coast Guard personnel in Boston, the eastern United States, who are conducting the search, held a press conference on the afternoon of the 20th.
According to this, although they are searching 24 hours a day, they have not yet been able to find it.
The submersible is equipped with 96-hour life-sustaining equipment, including emergency oxygen, but the person in charge said, "There are about 40 hours of air left to breathe."
Searches are being conducted extensively by U.S. and Canadian militaries and coast guards, using aircraft, remote-controlled submersibles equipped with cameras and robotic arms.
The Titanic is currently sinking to the seabed at a depth of about 4000,<> meters, far from the coast, which the Coast Guard describes as a complex geographical and technical search operation.
France also searches, Titanic researchers go to the scene
The French government announced on the 20th that it had dispatched a ship loaded with underwater robots capable of performing operations in the deep sea to the site to conduct a search.
On board the submersible is Paul-Henri Narjoret, 76, a French expert who is studying the Titanic.
The ship is expected to arrive in the area where the submersible disappeared around 22 a.m. on the 3nd, Japan time.
The French government says it is "in a race against time" and wants to speed up the search in cooperation with the United States, which has already begun the search.