I went looking for one and, didn't find any. I have found them before. The holes are already exposed and, not from pounding the sand. As I said on the video I have ran into crab the same as anyone else. When I hit the crab at 3 inches I back off the clam gun and, dig with my finger to see that it's a crab. From there I have to learned leave it alone.
I run into these during the early digs of each year. I simply just go easy for the first few inches and if I feel anything at all I move on to the next hole. You can also scrap the sand out a bit and find em by hand. I also make sure to point it out and teach others.
@seasonaloutdoorswitherin297 there could be a large number of things going on. I just don't understand why people feel the need to shove clam guns down so hard. It doesn't do any good. If anything you just increase your chance at breaking clams