is this a deep discreet hole needed to throw say.. a rug into or is this more of a drainage issue, cause it depends how determined you are, you can dig a hole in winter... it'll just take you longer.
I remember a winter exercise in Gagetown when they told us to dig 2 man trenches... they turned out to be shell scraps about 2 inches deep... it was November and Gagetown is made of rock. but hey this is the prairies.. easy digging right?