"I was heading in for a perfect landing and then bang, the plane turned upside-down," financier and pilot Sven Hagströmer told the Expressen newspaper.
The 70-year-old Swede was out for a spin at the end of last week when the accident occurred, as he tried to land the sea plane on the waters of the Norrtälje municipality.
"I was hanging upside-down in my seatbelt and the water rushed in. Then I could only think: It's getting really, really cold here," he told the paper.
As soon as the water reached Hagströmer's head, he took a deep breath, unclipped his safety belt, and swam to the surface.
Ninety minutes later, the pilot was found clinging to the floating plane's pontoons by passing women in a motorboat.
The 70-year-old admitted that the crash was his own fault, as he forgot to take up the landing wheels when approaching the water.
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Hagströmer told the paper that the incident would mark his last behind the controls of a plane.