Rescuers 'need a miracle': search continues for the bathyscaphe that sailed to the Titanic

The search operation has reached a tipping point, according to researcher David Gallo. This is according to CNN.

It is noted that state-of-the-art equipment is being brought in for the international search operation. In particular, the US Coast Guard is exploring the seabed, while aircraft are searching for the trace of the bathyscaphe from the air.

It's tough because the oceans are impenetrable - you can only use sound for effective imaging and you have to be almost on top of the object to see it," said David Gallo, senior advisor for strategic initiatives at RMS Titanic Inc.

What is known about the submarine's disappearance

communications with OceanGate Expeditions' bathyscaphe Titanic disappeared on 19 June. There were five people aboard the boat on a tourist excursion to the Titanic wreck.

According to the BBC, shortly after losing contact, the vessel began to sink deeper and deeper. The bathyscaphe had a limited oxygen supply - a total supply of 96 hours. Experts estimate the air should run out today.

A Canadian search plane picked up underwater noises on Tuesday and Wednesday. Rescuers are hoping they are coming from a submarine. However, deep-sea experts are unable to pinpoint this.

But it is hoped that they could have been short, sharp, relatively high-frequency noises that originated intermittently from inside the vessel due to a solid object hitting the end of the submarine," the report said.

British businessman and explorer Hamish Garding, 58, a British businessman with his son Salman, French explorer Paul-Henri Narjole and OceanGate chief executive Stockton Rush, who was on board, are known to have been on board.