The only real bad one I've had was on a Boxing Day dig to a fox a few seasons back in an empty man made lagoon. The mark was 16 ft but it was all sand so easy enough digging, half way down my mate asked if I'd be ok to carry on while he went for drinks etc and to meet another lad to bring back to help us, I said no problem, I carried on alone while they were gone, once they came back we werent far from breaking through, broke through not long after and as I got down on my knees to look up the tube I heard the lads shout and as I stood up half the dig collapsed right up above my waist and they