Search teams from the U.S. and Canadian Coast Guards are continuing efforts to locate a small tourist submarine carrying five people, which went missing during a trip to visit the wreck of the Titanic in a remote area of the Atlantic Ocean off the North American coast. Authorities were notified of a loss of communication with the "OceanGate Expeditions" submarine on Sunday afternoon, as confirmed by Admiral John Mauger of the U.S. Coast Guard. Mauger stated, "We are putting in very significant efforts," noting that the search is focused on an area approximately 1,450 kilometers east of Cape Cod, at depths reaching 4,000 meters. He added that searching in this remote area is extremely complicated, and the estimated oxygen supply in the submarine is around 70 hours or more. Among those on board the submarine is billionaire Hamish Harding, the chairman of the private aviation company "Action Aviation." The search involves two aircraft, one American (a C-130) and one Canadian, equipped with sonar capable of detecting submarines, according to the U.S. Coast Guard. "OceanGate Expeditions" confirmed in a statement that they are making every effort to ensure the safety of the submarine's crew and return them safely. The wreck of the Titanic, which was the largest ship in the world at the time, was discovered in 1985, located 650 kilometers from the Canadian coast, at a depth of 4,000 meters in the international waters of the Atlantic Ocean. Since then, treasure hunters and tourists have visited the wreck. The Titanic was a massive and very famous passenger ship built in the early twentieth century, designed to be the largest and most luxurious ship in the world and one of the latest technical achievements of that time. However, the tragedy of its wreck made it historically renowned. On its maiden voyage, which began on April 10, 1912, the Titanic departed from the port of Southampton, England, bound for New York. On Tuesday, John Kirby, the strategic communications coordinator for the U.S. National Security Council at the White House, stated that the U.S. is coordinating with Canadian authorities to locate the tourist submarine and that the U.S. Navy is ready to intervene to locate the submarine, which was on a mission to document the Titanic wreck. The American official said, "We are coordinating with Canadian authorities to locate the tourist submarine, and the U.S. Navy is ready to intervene." On April 14, it collided with an iceberg in the Atlantic Ocean, leading to its sinking.