You begin to quietly work on the door. After about fifteen minutes, you are able to lift it away and set it aside.
During this time, those of you standing guard will hear some faint noises like those created by the centepedes you have already fought. You do not think they are heading this way, but it is hard to tell how far away or in which direction they lurk.
When the door is removed, you see a ten foot passage leading up to a second, identical door.
It is stuck as well, but seems even more moist and rotten than the first. It will take less time and effort to remove, though it won't come out in one nice neat piece.