FIVE unanswered questions remain after the Titanic sub tragedy amid fears the bodies may never be found.
"True explorers" Stockton Rush, Brit billionaire Hamish Harding, Paul-Henri Nargeolet, Shahzada Dawood, and his 19-year-old son Suleman all passed away in the horror.
Here, we break down what questions remain about how the horror unfolded.
A deep-sea robot sub found five major pieces of debris on the seabed two miles beneath the surface.
They included parts of the pressure hull and a nose cone.
Rear Admiral John Mauger, of the US Coast Guard, said the debris was 1,600ft from the bow of the Titanic, and “consistent with a catastrophic loss of the pressure chamber”.
But it is not clear what caused the vessel - specially designed to withstand extreme depths - to implode.
On Wednesday, it was reported that sounds were heard underwater during the search for the missing Titan sub.
At the time, it sparked new hope that the crew members could have been signalling for help.
Searchers claimed they heard banging in 30-minute intervals while looking for the vessel.
A Canadian aircraft also detected the sounds in the area where the crew disappeared.
US Coast Guard captain Jamie Frederick later confirmed the deep-sea noises had been heard and were being analysed by sonar experts to establish if they came from the 22ft craft.
Carl Hartsfield, another expert involved in the search, told reporters it was very tough to discern what the noises were.
He said: "We have multiple sensors in the area taking the data back to the best people in the world and feeding this back to the team so they can make decisions.
"They have to eliminate potential manmade sources other than the Titanic."
However, at the press conference on June 22, Rear Admiral Mauger said there did not appear to be any connection between the underwater noises detected during the search and rescue mission and the location of the debris on the seafloor.
What the banging noises actually were remains unknown.
OceanGate Expeditions has been criticised for an eight-hour delay before it alerted the US Coast Guard that it had lost contact with the Titan.
The vessel submerged at 1pm UK time on Sunday around 400 miles southeast of St John's, Newfoundland.
But roughly after an hour and 45 minutes into the descent, it lost contact with the Polar Prince.
However, it wasn't reported missing to the US Coast Guard until eight hours later at 10.40pm.
Kathleen Cosnett, a cousin of Hamish Harding, told the Telegraph the eight-hour delay was "far too long".
Kathleen said: "It's very frightening. It took so long for them to get going to rescue them, it's far too long.
"I would have thought three hours would be the bare minimum."
OceanGate has not explained the delay.
A series of crucial safety blunders were made before the sub vanished on the trip to see the Titanic wreckage on Sunday.
In a haunting interview before the vessel became lost, OceanGate CEO Stockton Rush - who was on board - claimed there should be "limits" to safety precautions.
He told just last year: "You know, at some point, safety is just a pure waste.
"I mean, if you just want to be safe, don't get out of bed, don't get in your car, don't do anything. At some point, you're going to take some risk, and it really is a risk-reward question.
"I think I can do this just as safely while breaking the rules."
And it's been revealed that OceanGate was involved in a huge lawsuit over fears about the sub’s safety.
Ex-employee David Lochridge claims he was fired after he raised his concerns and demanded more rigorous safety checks be put in place on the submissible.
Court documents, seen by The Sun, said he complained that the vessel was not capable of descending to the extreme depths necessary to view the Titanic wreckage.
The Legal files show OceanGate sued Lochridge, who was “responsible for the safety of all crew and clients”, for disclosing confidential information about the Titan.
However, Lochridge then filed a counterclaim - alleging that he had been wrongfully fired from his role over being a whistleblower about the quality and safety of the vessel.
In November 2018 the case settled out of court.
David Pogue, a CBS Sunday Morning reporter and ex-passenger of the Titan, revealed that while the vessel was lost last year he questioned the company's emergency system.
He said the surface vessel was not carrying a distress beacon - which is activated by boaters in emergency situations.
When activated, it alerts a worldwide Search and Rescue (SAR) network designed to send rescuers to the boat's exact location quickly.
Pogue said: "This submersible does not have any kind of beacon like that.
"On my expedition last summer they did indeed get lost and adding such a beacon was discussed."
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