The F-111 had a 'cockpit module' that was designed to be jettisoned with the two crew still in their seats and could then provide a full support 'environment' for them when it had landed in the deseret/ocean.
As I recall, one of these came down in the UK in the early 1990s (on an industrial site but missed the town - cue the cheers from the newspapers) and the module landed upside down which was aproximately 180 degrees away from the design intention. But I sit to be corrected.