Being buried alive is usually near the top of any worst-ways-to-die list. But how about being buried alive 100 feet below the ocean surface in a tiny pocket of air? For Harrison Okene, a 29-year-old Nigerian boat cook, this nightmare scenario became a reality for nearly three grueling days.
The story began on May 26 at about 4:30 a.m., when Okene got up to use the restroom. His vessel, a Chevron oil service tugboat called the AHT Jascon-4, swayed in the choppy Atlantic waters just off the coast of Nigeria. What caused the tugboat to capsize remains a mystery, though a Chevron official later blamed a "sudden ocean swell."
Okene was thrown from the crew restroom as the ship turned over. Water streamed in and swept him through the vessel's bowels until he found himself in the toilet of an officer's cabin. As the ship settled on the ocean floor, the water stopped rising.
For the next 60 hours, Okene - who was without food, water or light - listened to the sounds of ocean creatures scavenging through the ship on his dead crewmates. Like a living Phlebas the Phoenician, he recounted his life's events while growing more resigned to his fate.
Unbelievably, Okene survived his underwater ordeal long enough to be rescued.
When Maxim Umansky, a physicist at the Lawrence Livermore National Laboratory in California, read about Okene's miraculous rescue, his interest was piqued.
"For a physics question, it's an interesting problem," said Umansky. "Of course, I'm also glad the man survived and happy with the ending of his story."
Umansky began conducting his own calculations to quantify the factors responsible for Okene's survival. He also posed a question to a physics Web forum: How large does a bubble have to be to sustain a person with breathable air?
Okene's salvation - the air bubble - was trapped because the overturned boat acted as a sort of diving bell, the cup-shaped chambers that have transported explorers and workers into the depths for centuries.
Whether in a bell or boat, trapped air rises to the top of a concave chamber. The only way it can escape is by diffusing through the water itself, one molecule at a time. Eventually this would happen, but Okene would have succumbed to thirst, hypothermia, or asphyxiation long before his air bubble diffused into the ocean.
Asphyxiation typically claims victims of live burial. If someone is trapped in an enclosed space, exhaling CO2 with every breath, the proportion of oxygen steadily decreases while the level of carbon dioxide increases. It's the deadly CO2, not the lack of oxygen, that ultimately kills a person.
In an enclosed coffin, a person may produce deadly levels of carbon dioxide within two hours or so.
But Okene didn't asphyxiate despite being trapped in a small, sealed space for 60 hours. How was this possible?
MATHEMATICAL STORY PROBLEM
The water encapsulating his air bubble may have played a role in his survival. Carbon dioxide, more so than oxygen or nitrogen, readily dissolves into water - especially cold water.
Humans require 10 cubic meters of air per day. But Okene was breathing at 100 feet, or 30 meters, below the surface of the water. For every 10 meters a person descends, one atmosphere of pressure is added. This compresses gas and makes it denser, according to Boyle's law.
Because Okene was trapped at 30 meters below the surface, his air supply became denser by a factor of four. This means he needed only 6 cubic meters of air to survive rather than 25.
A space of about 6 feet by 10 feet by 3 feet would be sufficient to supply that amount of air.