A man has completed a world record of living under water for 120 days, and apparently, it gave him some enlightenment about the human race.
A German aerospace engineer has set a new benchmark after spending the longest continuous period living beneath the surface without depressurization, off the coast of Panama.
Rudiger Koch lived inside a 30-square-metre capsule. When he finally returned to land after almost four months, Guinness World Records adjudicator Susana Reyes presented him with the official recognition.
Koch is also the co-founder of Ocean Builders, the company behind the concept, design, and construction of the working underwater living space used for the 2024 attempt.
At 59, he surpassed the previous record held by American Joseph Dituri, who spent 100 days in an underwater habitat in a Florida lagoon.
Dituri’s record stood for two years after he began his stay in July 2023.
During that earlier challenge, Dr Dituri made headlines by saying his time underwater had ‘de-aged’ him by 20 years, suggesting changes to his body’s internal markers—especially those linked to inflammation.
While Koch hasn’t claimed any similar age-related effects, he did say the experience left him reflecting on humanity in a different way.
“It was a great adventure and now it’s over there’s almost a sense of regret actually. I enjoyed my time here very much,” Koch said, per The Guardian.
Halfway through the mission, he told an AFP journalist he hoped the project would shift how people think about human life—particularly where it might be possible to live.
“What we are trying to do here is prove that the seas are actually a viable environment for human expansion,” he said.
Guinness World Records wrote on its website that Koch had ‘entered Ocean Builders SeaPod Alpha Deep at a depth of 11 m (36 ft) just off the coast of Puerto Lindo, Provincia de Colón, Panamá, on 26 September 2024 and left on 24 January 2025’.
It added: “For this attempt, the Seapod was used as the facility, which featured both above and below water living areas. This record attempt was intended to show the potential for sustainable ocean living and expand our understanding of future habitat possibilities.”
Koch’s interest in undersea living reportedly traces back to classic fiction. A fan of Captain Nemo from Jules Verne’s 19th-century novel Twenty Thousand Leagues Under the Sea, he kept a copy of the book by his bedside.
Despite the unusual setting, the pod wasn’t exactly bare-bones. He had access to everyday comforts and equipment that made the long stay more manageable.
Reports say the capsule included essentials and entertainment such as a bed, toilet, TV, computer and internet, along with an exercise bike.
The living module was connected to an additional space above the waterline, featuring a staircase that allowed visitors to come down, deliver meals, and potentially bring a doctor if one was needed.
Power came primarily from solar panels at the surface, with a backup generator available if required, helping him maintain day-to-day needs while he focused on the broader purpose of the experiment.
It’s an impressive feat—though it’s not exactly the kind of “vacation” everyone would be eager to try.