get their way, the tradition of swimming in the channel between france and england could go, well, belly up. why? here s bbc s graham satchel. three, two, one. come on, jane. reporter: dawn over dover and a relay team, the leybourne lovelies, are getting ready to swim the channel. one, two, three, four. reporter: on the shoreline, more and more swimmers are practicing. this year we have had as many as 300 swimmers register with us. it has just grown beyond belief. reporter: organizers put the rise in channel swimmers down to david wyyams and sport relief before he crossed the channel four years ago, less than 700 had ever done it. this year alone there were 266 crossings. this is what the swimmers are heading into, the busiest shipping lane in the world. cross channel swimming is as dangerous as a pedestrian trying to cross the i-25. reporter: cross channel swimming is self-regulated, but
three, two, one. come on, jane. reporter: dawn over dover and a relay team, the leybourne lovelies, are getting ready to swim the channel. one, two, three, four. reporter: on the shoreline, more and more swimmers are practicing. this year we have had as many as 300 swimmers register with us. it has just grown beyond belief. reporter: organizers put the rise in channel swimmers down to david wyyams and sport relief before he crossed the channel four years ago, less than 700 had ever done it. this year alone there were 266 crossings. this is what the swimmers are heading into, the busiest shipping lane in the world. cross channel swimming is as dangerous as a pedestrian trying to cross the i-25. reporter: cross channel swimming is self-regulated, but