Late 1970's with the Wittering crash team, recovering a Harrier GR3 which had shot itself down on the Holbeach range. The debris was in the mud below the high water mark and we had spent all of a Saturday morning collecting debris into plastic bags which went into a net and were being carried to dry land under (I think) a Wessex when the net opened. With a collective sigh we slurped across several hundred yards of mud and started again.
In the FI in the early 80s, didn't an infantry detachment come down Mt Kent in the ISO rubbish container under a Chinook?