When the Titan submersible, carrying five sightseers to the wreck of the Titanic, blew up thousands of metres under the ocean surface in June, it underscored why humanity knows more about the surface of some other planets than about the depths of the Earth's oceans. Oceans cover more than 70 percent of the earth's surface. Yet, this underwater world is a challenging place to explore, as the Titan disaster showed. The deepest point under water, the Challenger Deep in the Pacific Ocean, is 11,000 metres deep, more than the height of Mount Everest. The light doesn't penetrate to such depths.

A video of a Coca-Cola being instantly crushed by water pressure gives an idea of what likely happened to the destroyed Titan submersible that claimed five lives. The pressure chamber on board OceanGate's 22-ft vessel suffered a'catastrophic implosion', authorities revealed on Thursday, and the men aboard tragically perished. The implosion would have been caused by a sudden change from low to high pressure inside the sub, possibly triggered by a defect in the sub's walls. Experts say the crew and passengers would have been crushed within a fraction of a millisecond, an event so fast it would have been over before they realized what was happening and so violent it's unlikely to leave anything but a mist of human remains. A video posted by James Hambley, a YouTuber who goes by the alias Barded Science Guy, shows a similar implosion happening to a Coke can.

First Coast Guard District Rear Admiral John Mauger offers his condolences to the loved ones of the Titan submersible crew on'America Reports.' BOSTON – EXCLUSIVE: Stockton Rush, the 61-year-old adventurer and CEO who died this week along with four other crew members in a catastrophic implosion near the bow of the Titanic, appeared in a series of never-before-seen surreal images captured during testing of the vehicle years ago. In the series of May 2018 photos taken in Abaco, Bahamas, and obtained by Fox News Digital, Rush can be seen peering through the vessel's lone porthole, testing out computer equipment inside and posing next to the 21-foot submersible on the deck of a ship before the test run. They were captured by underwater photographer Becky Kagan Schott, who said Rush had tested the vehicle numerous times in the area, and she befriended the adventurer. The Titan was designed to reach depths of 4,000 meters, according to OceanGate, the company Rush founded in 2009. It was meant for a variety of purposes, including scientific research, media production, and site surveying.

A former OceanGate Expeditions customer who took a trip to see the Titanic wreckage two years ago described the dive as a "kamikaze operation." An international search and rescue operation is ongoing for five crew members on OceanGate's Titan sub, which went missing Sunday on a planned deep sea tourist expedition. Arthur Loibl, a retired German businessman and adventurer who went on the same trip in 2021, shared his experience with OceanGate in an interview with The Associated Press. "You have to be a little bit crazy to do this sort of thing," Loibl said. He explained that the idea of touring the Titanic wreckage came to him on a trip to the South Pole in 2016.

Inside the sealed vehicle are OceanGate CEO Stockton Rush; British businessman turned adventurer Hamish Harding; father-and-son Shahzada and Suleman Dawood, who are members of one of Pakistan's wealthiest families; and Paul-Henry Nargeolet, a former French navy officer and leading Titanic expert. The U.S. Coast Guard headed a unified command that involved commercial assets, research vehicles and military counterparts from Canada, France and the United Kingdom.

While ROVs vary in design and capability, they can generally travel much deeper than manned vessels, Englot said. "Those kind of vehicles usually have robotic arms that are capable of carrying a payload, grasping an object, grabbing and turning a knob or a valve or something like that," he added. As of Thursday morning, several with the ability to reach the ocean floor had been deployed in the Atlantic as the Titan's estimated initial supply of 96 hours of oxygen dwindled – including the Victor 6000, which descended from the French L'Atalante research vessel to the ocean floor. File image of an asset of the rescue efforts – the Victor 6000 – an unmanned French robot which can dive up to 6,000 metres. It has arms that can be remotely controlled to cut cables or otherwise help release a stuck vessel. However, it does not have the capability of lifting the submersible on its own.

The U.S. Coast Guard said Tuesday afternoon that there around 40-41 hours of "breathable air" left on the OceanGate Titan submersible that disappeared en route to the Titanic wreckage in the North Atlantic. Deep-sea vehicle industry insiders say the combination of the enormous depth, the lack of communication and the rapidly dwindling window of opportunity make rescue of the five people aboard the OceanGate highly unlikely. The OceanGate was bringing its passengers to see the wreckage of the Titanic, about 12,500 below sea level, when it went missing on Sunday. The OceanGate has about 40 hours of oxygen remaining, the Coast Guard reported Tuesday afternoon, assuming the vehicle did not suffer an instant catastrophic explosion, as some experts have said they fear. "The math is not great," one career expert in autonomous underwater vehicles, more commonly known as drones, told Fox News Digital.

A tourist submersible taking passengers down to the Titanic wreck site has gone missing with a search currently underway. Former Navy submariner Bryan Clark joins'Fox & Friends' to discuss. The Titan submarine OceanGate has been charging tourists around $250,000 each to ride in is operated by an inexpensive video game controller, its CEO revealed in a video interview last year. Stockton Rush, during a segment aired by "CBS Sunday Morning," said "we run the whole thing with this game controller" while holding up what appears to be a modified Logitech F710 wireless gamepad. The device first debuted in 2011, according to the gaming website Dexerto, and a refurbished version of it currently retails for $30 on Amazon.