The search for the lost underwater Titanic-exploring submersible carrying five tourists got a glimmer of hope on Wednesday with news that a Canadian surveillance plane “detected underwater noises” in the remote area of the North Atlantic where it went missing over the weekend. The U.S. Coast Guard put out a statement on Twitter with the critical update.

In the tweet, the Coast Guard explains, “Canadian P-3 aircraft detected underwater noises in the search area. As a result, ROV operations were relocated in an attempt to explore the origin of the noises. Those ROV searches have yielded negative results but continue.”

A follow-up tweet continues, “Additionally, the data from the P-3 aircraft has been shared with our U.S. Navy experts for further analysis which will be considered in future search plans.”

Further verification of the search update was provided by Rear Adm. John Mauger of the U.S. Coast Guard in his Gayle King interview with CBS Mornings on Wednesday. He confirmed that noise was detected on Tuesday but stressed that “we don't know the source.” He also noted that the data had been shared with the U.S. Navy.

The update led to more rescue vessels being sent to the search area on Wednesday in a full-force attempt to locate the Titan submersible before it runs out of oxygen. It is believed to currently have less than a day of breathable air remaining.

The Coast Guard announced it would give another search update at 1 p.m. Eastern time.

The Titan, a 22-foot-long vessel, lost contact on Sunday. It had set out for a two-and-a half-hour journey to the wreck of the Titanic, which is located more than two miles below the surface. OceanGate Expeditions is the company that owns and operates the Titan, and had been warned for years about the danger of deep-seas tourism and possible “catastrophic” problems with the vessel's design. For now, all anyone can do is cling to hope that the detected noise came from the submersible until further updates are provided.