Chris Brown, a British multi-millionaire digital marketer, has revealed that he pulled out of the ill-fated Ocean Gate Expedition trip to the Titanic wreck because “the risks were too high”.

Brown told The Sun that he had a couple of concerns and eventually emailed his withdrawal to Ocean Gate.

He and Hamish Harding, a three-time Guinness World Records holder, had decided to explore the Titanic wreck in the Atlantic Ocean shortly after they met each other in 2016.

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“I found out they used old scaffolding poles for the sub’s ballast — and its controls were based on computer game-style controllers,” Brown said of the Titan submersible vehicle.

“If you’re trying to build your own submarine, you could probably use old scaffold poles. But this was a commercial craft.

“Eventually I emailed them and said, ‘I’m no longer able to go on this thing’. I asked for a refund after being less than convinced.”

The trip to the Titanic wreckage site on Ocean Gate Expedition’s Titan cost $250,000 per passenger.

Harding and four other passengers began the voyage on Sunday. About one hour and forty-five minutes later, the submersible lost contact with its mother ship.

Paul-Henri Nargeolet, a French diver; Stockton Rush, the founder of Ocean Gate Expeditions; Pakistani billionaire Shahzada Dawood; and his son, Sulaiman Dawood, were reportedly in the submersible when it went missing on Sunday.

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“I was one of the first people to sign up for this trip with Ocean Gate while the submersible was being developed,” Brown explained.

“We decided the risks were too high in this instance, even though I’m not one to shy away from risk.”

Brown said that he heard that the Titan submersible had missed some key targets during depth testing.

FIJ had reported how experts complained about the trip as rescuers raced against time to save Harding and other passengers.

Chris Parry, a former Royal Navy warfare officer, said that locating the vessel would be like “finding a needle in a haystack”.

Parry said that a reliable informant told him about the Titan submersible having structural issues five weeks earlier.