What kind of distress calls would an aircraft crew make if they believed their aircraft is going down, either over sea or on land? If the aircraft was in control for a sufficient time to allow the crew to bale out, or to do an ordered ditching, would the Radio Operator have any standard phrases he would use to indicate their going down? Do they ever use "May Day! May Day!" type of emergency calls when hit or going down?

I am sure there will be different answers depending on type, unit, area of operations. Appreciate all inputs on these