Still booooring

I am seriously ready to drive myself to Spokane and hit up all the pet stores and stock my tank with new crabs. All three are burried STILL! I can see the legs of one in the bottom corner of the tank, under about 6 inches of playsand. I found Mr. Krabs last week. I could hear scratching on both sides of the tank, one under the hermie hut a lot louder. So I lifted it up, and he was there, at the very bottom, nothing covering him. Weird, cause there was about 3 inches of ecoearth there before. Of course I couldn't resist, picked him up, checked him out, noticed nothing different. He scootched to the opposite end, right above where the crab is that I can see now, so not sure if thats him. And then several days later, I could see the legs, and heard two different scratching and crawling sounds, so as of early last week, all three were alive. But its been totally silent since. I can see those legs changing posisitions multiple times during the day. So at least one is still alive. But they are driving me mad with the hiding.