Just went out and bought this about foot long crow bar with handle end I can hit with a heavy hammer to dig. It also came with three smaller headed crow bars of various sizes, just 9 bucks. Photo
Now that's determination to hunt through the winter Bergie!!!
Maybe I should get a core drilling machine -- the kind they use to take ice core and ground core samples... I could look for targets, drill a 12" x 1' core and bring all the cores in the house to warm up -- then pick through them when they warm up, and put them back in through ground!
Maybe the kids could help -- I could dig square cores, triangular cores, etc.. And it'd be like a big yard-puzzle.