He had survived. He had also lived.
—
## The Mathematics of Attrition
The first thing that matters, in any honest accounting of what Poon Lim survived, is the mathematics of his situation — the specific numbers that define why one hundred and thirty-three days on a Carley float in the South Atlantic is not a story of luck but a story of applied intelligence under extreme constraint.
Begin with the basic physiology. A person in a tropical climate, at rest, requires approximately two to three liters of drinking water per day to maintain basic organ function. A Carley float carrying roughly ten imperial gallons of fresh water — approximately forty-five liters — provides fifteen days of water for one person at minimal intake. Stretch that rationing as much as possible: perhaps thirty days, if conditions allow and the person is managing their exertion levels. Beyond that, without a secondary source, the math turns fatal.
The food calculation is similarly unforgiving. The standard emergency ration packs carried on British merchant vessels in the wartime period were designed around the thirty-day survival window — the estimated time between sinking and rescue that the convoy system and Atlantic patrol operations made plausible. Poon Lim’s specific inventory of hardtack, pemmican, chocolate, and evaporated milk was calibrated to that horizon, not to anything beyond it.
He was rescued on day one hundred and thirty-three. The gap between the thirty-day design life of his supplies and the one-hundred-and-thirty-three-day actual duration of his ordeal had to be filled by something else entirely. What filled it was a combination of equatorial marine biology, basic engineering improvisation, and the methodical application of everything he knew about the ocean to the problem of extracting resources from it.