Keep in mind that if an aircraft was in imminent peril, every last effort would be made by the pilots to bring the aircraft under control. A mayday call will not keep you from dying, and will do nothing to help the airplane. Every bit of your effort would be going to saving you and your passengers.
It is completely understandable to me why a mayday call would not be made in a situation like that, even assuming that the crew were conscious throughout.
It is also possible that for some reason (rapid decompression) that the crew may not be conscious.
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