I have a rectangular cover on my basement floor, about 1'+ x half a foot. There is a bolt on it and when I try to unbolt it, the bolt keeps turning but is not loosening. What is under the cover? The word "Electric" is stamped on it and the whole cover is green. Someone told me that they doubt it is anything electrical and besides, I had water in my basement a few weeks ago and there was a puddle of water on the cover. I just want to know if there's a drain under there that I can use beacuse I have water in my basement again and would like any easier way of getting rid of it besides using a shop vac.

Do most basements have a floor drain? Just curious how common these are since I don't have one.

Thanks.