With time running out, search and rescue operations are ramping up for the submarine that disappeared Sunday with five people on board in the remote and heavy waters of the North Atlantic Ocean, as detected by a sonar-equipped Canadian aircraft. More supplies are being delivered to the target. Noise occurred two days in a row.

US Coast Guard Response Coordinator Capt. Jamie Frederick said at a press conference Wednesday that the sound was first detected on Tuesday and was heard again Wednesday morning.

Five surface ships and two remote controlled vehicles are targeting the area where the noise was detected.

“Although, [remotely operated vehicle] The search yielded negative results, but the investigation continues,” Frederick said.

More resources are expected to arrive in the next 24-48 hours, including five additional ground assets and several more remotely operated vehicles.

An adviser to Oceangate Expeditions, which owns and operates the missing 21-foot submarine called Titan, described the sound as a “rhythmic tapping sound” that “matches the sound…” of people hitting the hull. bottom. The adviser was not authorized to speak to the media about the matter, but he requested anonymity.

Frederick declined to comment on the details of the sound. “I don’t know what it is,” he said at a press conference.

Carl Hartsfield, director of the Woods Hole Oceanographic Institution and an adviser to the search effort, said the noise could be anything. “The ocean is a complex place,” says Hartsfield. “It’s clearly a human or natural sound, but it can be very difficult to identify the source of those noises.”

U.S. Navy experts are conducting an analysis to determine the source of the noise, officials said.

The Coast Guard confirmed the noise on Twitter Tuesday night. rolling stone magazine reported that “bangs” were detected at 30-minute intervals in the area where the submarine disappeared on Sunday. The report, based on an internal email from the Department of Homeland Security’s National Operations Center, said the Canadian aircraft detected the noise after deploying multiple small listening devices called sonobuoys.

Simone Baumann-Pickering, an acoustic ecologist at the University of California, San Diego, said in an email that multiple sonobuoys can be used to localize sound sources. One clue, she says, is whether the source is stationary or moving. The research team will look at the pitch, duration and repetition rate of the sound to determine its origin, she wrote.

Frederick said Wednesday he hadn’t heard that the noise was every 30 minutes. He stressed that the team is continuing to search the area where the noise was detected.

Officials said the search area was about twice the size of Connecticut and about two and a half miles deep.

Officials remain hopeful and optimistic about their mission.

“This is 100% a search and rescue mission,” Frederick said. “We will continue to put all available assets into finding Titans and members of the group.”

Three more ships joined the search on Wednesday. The John Cabot is a Canadian Coast Guard vessel with scanning sonar capabilities. Norwegian merchant ship Skandi Vinland. and another Canadian Coast Guard vessel, the Atlantic Marlin, with a remote-controlled vehicle. official said. Polar Prince, the research vessel Titan was launched from, and Deep Energy, a research vessel in the Bahamas, are also at the scene. Canadian and American aircraft survey the surface and use sonobuoys for underground searches.

Currently submerged remotely operated vehicles could reach depths of 13,123 feet, Frederick said. Among the five additional ships heading to the region is the French research vessel Latarante, which is equipped with underwater robots capable of operating at depths of 19,685 feet. A U.S. Coast Guard spokeswoman said they could arrive by midnight Wednesday, weather permitting.

Alfred Hagen boarded the Titan with one of the currently missing passengers. He described the trip as follows.

Officials said the search mission was “extremely complex” and required expertise and special equipment. The U.S. Coast Guard, U.S. Navy, Canadian Coast Guard and Oceangate have established a unified command to lead this effort, with aid from countries such as France and the United Kingdom and support from merchant shipping.

The submarine is dangerously short on oxygen supplies, so the crew continues to race against time, having searched a total of 10,000 square miles since the mission began on Sunday. Based on 96 hours of initial air supply, it is estimated that the submarine has about a day’s supply of oxygen left. Officials say the submarine has a “limited ration” of food and water.

The five people confirmed to be on board are Oceangate CEO and expedition pilot Stockton Rush. Hamish Harding, Chairman of Action Aviation, a Dubai-based aviation sales and acquisitions firm.Paul Henry Nargiolet, Veteran and Skilled Diver Over 30 visits to the sinking sitePakistani businessman Shahzada Dawood and his son Sulaiman. Harding and Nargiolet are both members of the Explorers Club. According to professional association.

The submarine went missing Sunday morning about 900 miles east of Cape Cod, Massachusetts, about an hour and 45 minutes after it began diving, after losing contact with the Canadian ship Polar Prince, the U.S. Coast Guard said.

Ocean Gate is conducting an expedition to the sea area with “Citizen Explorer”. Titanic It will be in use on Titan submarines from 2021, according to. website. A trip can cost about $250,000.

But the company has long come under intense scrutiny from industry experts and its own employees for not adhering to safety standards for the Titan and Titanic expeditions.

The Marine Technology Association’s Manned Submersibles Committee, which advocates for ocean technology and resources, sent a private letter to Rush in 2018 requesting permission for a third-party safety review of Titan. The letter said Titan’s marketing “is at least misleading the public and violates industry-wide codes of professional conduct that we all strive to uphold.”

“We are concerned that the current experimental approach taken by Oceangate will have negative consequences, ranging from minor to catastrophic, that will severely impact everyone in the industry. It’s possible,” the letter said.

Commission chair William Connen told The Times that Mr. Rush’s more blunt style of innovation has troubled industry leaders who felt compelled to speak up. “Oceangate raised a lot of eyebrows and caused a lot of discussion,” said Coenen.

That same year, a former Oceangate employee, David Rotchridge, filed a lawsuit against the company, pointing to Titan as a red flag for “Oceangate’s refusal to perform critical non-destructive testing, particularly on experimental hull designs.” stood. The submarine pilot, Mr. Rotchridge, who was hired to conduct quality and safety inspections, said he was fired for coming forward. He said he disagreed with Rush’s decision to “expose passengers to potential extreme dangers on the experimental submersible.”

Oceangate said in its own court papers that Loch Ridge did not accept information provided by the chief engineer regarding the safety of the ship. He also alleged that he submitted false reports to the Occupational Safety and Health Administration and violated contracts by discussing confidential company information with outside parties.

The lawsuit was settled in 2018. Mr. Rochridge did not respond to a request for comment.

Times staff writer Jeremy Childs contributed to this report.