There is a good book called "Bit of a Tiff "which tells of the ejections of Lyn Middleton from Hms Eagle in 1956 from 2 Seahawks 897/899 squadrons the first being underwater as the ship passed over him the seconed one being dunked in the sea when the cat broke on launch
PS to D buccaneers only had underwater ejection fitted to aircraft from 65 onwards!!!!!!