Arthur Loibl, one of the submersible company Oceangate’s first customers, holds up a photo of the Titanic in Straubing, Germany, on Wednesday. Loibl characterized a dive he made to the site two years ago as a “kamikaze operation.” Armin Weigel/dpa via Associated Press

BERLIN — As an international search determined the vessel that disappeared on its way to the underwater wreckage of the Titanic had imploded, killing all five people onboard, a man who was one of the submersible company’s first customers characterized a dive he made to the site two years ago as a suicide mission.

“You have to be a little bit crazy to do this sort of thing,” said Arthur Loibl, a 61-year-old retired businessman and adventurer from Germany.

Loibl told The Associated Press on Wednesday that he first had the idea of seeing the Titanic wreckage while on a trip to the South Pole in 2016. At the time, a Russian company was offering dives for half a million dollars.

After Washington state-based OceanGate announced own operation a year later, he jumped at the chance, paying $110,000 for a dive in 2019 that fell through when the first submersible didn’t survive testing.

Two years later, he went on successful voyages, along with OceanGate CEO Stockton Rush, French diver and Titanic expert Paul-Henri Nargeolet, and two men from England.

“Imagine a metal tube a few meters long with a sheet of metal for a floor. You can’t stand. You can’t kneel. Everyone is sitting close to or on top of each other,” Loibl said. “You can’t be claustrophobic.”

During the 2½-hour descent and ascent, the lights were turned off to conserve energy, he said, with the only illumination coming from a fluorescent glow stick.

The dive was repeatedly delayed to fix a problem with the battery and the balancing weights. In total, the voyage took 10½ hours.

The group was lucky and enjoyed an amazing view of the wreck, Loibl said, unlike visitors on other dives who only got to see a field of debris or, in some cases, nothing at all. Some customers lost nonrefundable payments after bad weather made descent impossible.

He described Rush as a tinkerer who tried to make do with what was available to carry out the dives, but in hindsight, he said, “it was a bit dubious.”

“I was a bit naive, looking back now,” Loibl said, likening it to a “kamikaze operation.”

The OceanGate submersible carrying Rush, Nargeolet, a British adventurer, and two members of a Pakistani business family disappeared Sunday after setting out for the wreckage of the famed ship, which struck an iceberg and sank in 1912, killing all but about 700 of the roughly 2,200 passengers and crew.

The U.S. Coast Guard announced Thursday that the missing submersible had imploded near the wreckage of the Titanic, killing all five people onboard.

Newly uncovered allegations suggest that significant safety warnings were made during the development of the submersible, dubbed the Titan.