Early on Wednesday, the U.S. Coast Guard reported that the sounds had caused remote-controlled vehicle searches to be redirected, noting that so far, the effort had “yielded negative results.”

The frantic search for the missing Titanic tourist submarine continued on Wednesday after Canadian planes reported hearing “underwater noises” in the search area.

Early on Wednesday, the U.S. Coast Guard reported that the sounds had caused remote-controlled vehicle searches to be redirected, noting that so far, the effort had “yielded negative results.”

The five people aboard the vessel, which vanished while on a mission to explore the Titanic remains, had less than 40 hours of oxygen left as of Tuesday afternoon, according to a Coast Guard spokesperson, searching for the sub a race against time.

CEO of OceanGate Expeditions Stockton Rush, Action Aviation owner and British billionaire Hamish Harding, French dive specialist Paul Henry Nargeolet, and well-known Pakistani businessman Shahzada Dawood and his son Suleman have all been named as having been on board the Titan, a ship that has gone missing.

The Titanic tourist submersible, currently missing with five people aboard, is a simple and small boat with a carpeted floor in place of seats and hardly enough room inside for more than one person to stretch out at a time, according to past passengers and promotional brochures.

The Titan is portrayed as having dimensions of 22 feet by 9.2 feet by 8.3 feet in promotional literature. Only one passenger may fully extend their legs in the illustration, referred to as the “typical seating configuration.”

According to previous visitors, the ship, which a computer game controller controls, is said to be devoid of a traditional bathroom.

It’s simply a car you drove into the water while intoxicated, according to Mike Reiss, a writer, and producer who has worked on “The Simpsons” and went on the trip last year.

More easily compared to space than many places on Earth, the search for Titan takes place in a harsh and unfriendly environment.

Down there, it’s entirely dark. It is chilly. The uneven seabed is covered in mud. Tim Maltin, a Titanic expert, and historian, stated in an interview with NBC News Now, “You can’t see your hand in front of your face. One remarked, “It’s like being an astronaut going into space.”

In contrast to space, fewer humans and fewer tools are available for search and recovery operations in the world’s waters.

The sub’s oxygen supply is the most pressing problem in the search. Still, Jamie Pringle, a professor of forensic geosciences at Keele University in the United Kingdom, says it is by no means the only one. He asserted that it is challenging to explore such great depths since the seafloor is more uneven than the land.