The bottomless pit? It's not actually bottomless. But people think it is. So they throw things they want to forget, or to stay forgotten, into the pit. Diaries, evidence, keepsakes, gifts from dead lovers, accursed knicknacks, bodies. But the thing at the bottom of the pit keeps them all. You see, it's forgotten as well. And where you have a flow of things from remembered to forgotten, you've got to have a flow the other way too. So while all those things keep falling down the pit to be forgotten, the Thing is starting to be remembered. Right now it's only half-remembered dreams, lunatic ravings, and vague untracable rumors, but they are getting stronger. When the Thing is enough remembered, it will climb up out of the pit and there will be reckoning then.