to see 200 of dolphins, 10,000 seals ocras swimming toward you, these things are immense. seven years ago as an off duty lifeguard, he tried but could not save the lives of three people in cornwall. the tragic memory drives him on. the effect of that for all of those people for decades to come was catastrophic, and that for me, i thoguht, i can't... ..i just don't want to see that happen to other people. with home—grown holidays on the rise this summer, sadly, so too, the number of accidental drowning. brendon prince hopes his epic voyage has gone some way to get the see safe message out there. would you do it again? maybe. no! no, no way. i've done this, maybe let's do something else. sarah ransome, bbc news.