I've still to see details of a modern commercial jet succesfully ditching in the open sea and merrily boarding pax onto rafts a la safety cards.The Nimrod is a military airframe(Dont tell me it's still a comet)and ditched into calm Moray Firth.The others are over/undershoots into calm lakes.Having spent many years at sea I can assure you that the North Atlantic in winter is nothing like the Municipal Pool in Horley!