Details have emerged of a "terrifying" incident off Sydney to Hobart yacht Porco Rosso, which had to recover a crew member swept more than one kilometre overboard on a deadly night of racing.

Luke Watkins, a member of the Rolex Sydney-Hobart’s 2017 handicap winner Alive’s crew, went over the side when Porco Rosso crashed off the back of a wave at 3.14am on Friday morning ...