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In this picture taken on June 1, 2017, a man warms up on a stairway leading down to a wooden pier below the "Sai Wan swimming shed" before swimming off the western tip of Hong Kong Island. Hong Kong's Victoria Harbour is one of the world's busiest ports, but every morning daring elderly swimmers dive in to its choppy waters against a teeming backdrop of ferries, cargo ships and fishing boats. / AFP PHOTO / Anthony WALLACE (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)

In this picture taken on June 1, 2017, a man warms up on a stairway leading down to a wooden pier below the "Sai Wan swimming shed" before swimming off the western tip of Hong Kong Island.
Hong Kong's Victoria Harbour is one of the world's busiest ports, but every morning daring elderly swimmers dive in to its choppy waters against a teeming backdrop of ferries, cargo ships and fishing boats. / AFP PHOTO / Anthony WALLACE        (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)