Yasutaka Kurokawa, 40, swam Aug. 15 from Germany's Fehmarn Island to Denmark's Lolland Island with three judges and a friend following in a boat, The Yomiuri Shimbun reported Monday.
He was the first person from Japan to swim the strait.
"It was really cold. I'm glad I've come home alive. I felt several times that it was beyond the limits of my ability. I'd like to thank the people who supported me," Kurokawa said.
Kurokawa said the stim took a total 6 hours and 24 minutes.
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