Early 2000’s I was flying a low level sortie in the Lake District when it went spectacularly wrong very quickly,... I put out a mayday on London mil (not heard but no surprise as coverage was weak when low level) and the nav transmitted on guard (243 and 121.5) in the subsequent enquiry it was found that at that precise moment someone was making farmyard noises which prevented our transmission being heard on 121.5, all I can say is thankfully the military guys don’t act like children and block emergency frequencies.
We are supposed to be professionals, act like it before it costs someone’s life.
as an aside we both got out and were unharmed.