Shahzada Dawood's elder sister Azmeh Dawood told that her nephew, 19-year-old Suleman Dawood, was terrified of going on the trip and went to please his Titanic- enthusiast dad.

She said that prior to the trip, her nephew had told a relative that he 'wasn't very up for it', as per the report. 'I am thinking of Suleman, who is 19, in there, just perhaps gasping for breath.. It's been crippling, to be honest,' she told the channel yesterday.

Rear Adm. John Mauger, of the First Coast Guard District, said that the investigation into what happened was already underway and would continue in the area around the Titanic where debris from the submersible was found.

There are also a lot of questions about how, why and when did this happen. Those are questions we will collect as much information as we can about now, Mauger said, adding that it was a "complex case" that happened in a remote part of the ocean and involved people from several different countries.

The missing submersible was destroyed in a "catastrophic implosion" during descent and all five aboard were killed, the US Coast Guard said early today. They said that a robotic diving vehicle discovered a debris field from the submersible Titan on the seabed, and identified five major fragments of the vessel. No mention was made of human remains.

Titan’ was on its descent to the wreck of the Titanic ship about 12,500 feet underwater when it lost contact with the surface vehicle on Sunday. OceanGate Expeditions, which ran the mission, also issued a statement saying there were no survivors among the five men aboard the Titan.

The passengers were OceanGate Expeditions CEO Stockton Rush, who was piloting the mission, British billionaire and explorer Hamish Harding, 58; Pakistani-born businessman Shahzada Dawood, 48, and his 19-year-old son, Suleman, both British citizens; and French oceanographer and renowned Titanic expert Paul-Henri Nargeolet, 77, who had visited the wreck dozens of times.

Tourist submersible went missing amid descent to Titanic on Sunday (June 18); vast search and rescue efforts were undertaken; 5 people aboard dead, confirms OceanGate and US Coast Guard.

The chances of recovery of human remains from the debris site on the seabed are likely to be dim, with a US Coast Guard official terming it an "incredibly unforgiving environment".

On asked about this during a press briefing, US Coast Guard Rear Admiral John Mauger said: "We'll continue to work and continue to search the area, but I don’t have an answer for prospects at this time."