Jonathan Ratcliffe, Swimming Through The Night Into Daybreak Courtesy of Jonathan Ratcliffe, Tsugaru Channel, Japan. When Jonathan Ratcliffe completed his most recent marathon swim, a 19.5 km crossing of the Tsugaru Channel from Honshu to Hokkaido in northern Japan in 11 hours 7 minutes, he chalked up his fifth Oceans Seven swim. The 45-year-old British