Tributes are being paid to the 5 males who had been killed after the lacking Titan sub suffered a "catastrophic implosion".
Three British citizens had been on board the small vessel, with Foreign Secretary James Cleverly describing their loss as "tragic news".
A famend Titanic skilled and an adventurer who held world data are amongst those that took the ill-fated voyage. Here are their tales.
Hamish Harding
Mr Harding was a 58-year-old British billionaire who proudly described himself as a world explorer.
Just earlier than the journey, he introduced that he was becoming a member of OceanGate Expeditions - the corporate that equipped the vessel - as a mission specialist.
He was primarily based within the United Arab Emirates, the place he labored as chairman for an plane brokering firm known as Action Aviation.
Mr Harding holds the Guinness world file for the quickest circumnavigation of the Earth by way of the North and South Poles by an plane - 46 hours, 40 minutes and 22 seconds.
The adventurer additionally holds the world file for the longest period at full ocean depth by a crewed vessel.
In 2016, he accompanied former astronaut Buzz Aldrin to the South Pole, when Aldrin turned the oldest particular person ever to achieve the Antarctic area on the age of 86.
And final yr, he additionally took half within the fifth human area flight by Blue Origin - an American aerospace firm based by Jeff Bezos.
Paying tribute to Mr Harding, The Explorers Club described him as a "dear friend" who "continued to push dragons off maps both in person and through supporting expeditions and worthy causes".
Read extra: What happened to the Titan sub
Shahzada and Suleman Dawood
Both British residents, Shahzada and Suleman Dawood had been father and son - and members of one in every of Pakistan's most distinguished households.
Their agency - Dawood Hercules Corp - invests throughout the nation in agriculture, petrochemicals and telecommunication infrastructure.
Based within the UK, Mr Dawood was a trustee on the SETI Institute, which searches for extraterrestrial intelligence.
The 48-year-old was additionally on the worldwide advisory board on the Prince's Trust International - based by King Charles to deal with youth unemployment.
Suleman, who was 19, had been learning at college.
Pakistani tv channels interrupted their traditional programming to announce they had been feared useless.
Tributes have been paid by Pakistan's international ministry and authorities officers.
Salman Sufi, an adviser to Prime Minister Shahbaz Sharif, wrote on Twitter: "Very sad and unfortunate news. Prayers for the families of deceased. Mr Dawood and family are in our prayers."
Stockton Rush
Mr Rush was the CEO and founding father of OceanGate, the corporate that started bringing vacationers to the Titanic in 2021.
This was the Titan sub's third voyage, and he was serving because the vessel's pilot.
He turned the world's youngest jet transport rated pilot on the age of 19, and flew industrial jets whereas in faculty.
In an interview with Sky News again in February, Mr Rush spoke about visiting the Titanic wreck.
"What really strikes you is how beautiful it is," he stated. "You don't normally see that on a shipwreck. It is an amazingly beautiful wreck.
"You can see inside, we dipped down and noticed the grand staircase and noticed among the chandeliers nonetheless hanging."
Mr Rush said he was motivated by a desire to document the Titanic's slow deterioration "earlier than all of it disappears or turns into unrecognisable".
Concerns had been raised about whether or not the Titan sub was secure as a result of it lacked worldwide certification - however the entrepreneur had argued that regulators had been holding his firm again and stifling innovation.
And in different interviews, he warned that nothing was with out danger - however an skilled pilot like himself might keep away from some widespread risks.
"What I worry about most are things that will stop me from being able to get to the surface - overhangs, fish nets, entanglement hazard," Mr Rush informed CBS News final yr.
Greg Stone - an ocean scientist and good friend of the businessman - stated: "Stockton was a risk-taker. He was smart. He was, he had a vision, he wanted to push things forward."
Paul-Henri Nargeolet
Mr Nargeolet was a former commander who served within the French navy for 25 years.
During his service, he turned the captain of the deep submergence group of the navy.
After leaving the navy, he joined the French Institute for Research and Exploitation of the Sea.
Mr Nargeolet had accomplished greater than 35 dives to the Titanic website, and supervised the restoration of over 5,000 artefacts.
The first British diver to go to the wreckage known as him as an "extraordinary explorer and an incredible individual" who knew the world higher than anybody else.
But admitting there have been dangers, Dik Barton added: "It's an incredibly hostile environment at the depths we are talking about. The pressure down there is 2,500lbs per square inch, that's the equivalent of two adult elephants on your thumbnail.
"If one thing goes mistaken, it goes mistaken in a short time."
Like Mr Harding, Mr Nargeolet had additionally been a member of The Explorers Club, which described him as "one of the foremost experts on submersible expeditions to the Titanic".
The membership's president, Richard Garriott de Cayeux, added: "They were both drawn to explore, like so many of us, and did so in the name of meaningful science for the betterment of mankind. They pushed themselves in their entrepreneurial pursuits as they did in exploration."
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