 With a 20–30 foot thick ceiling, the open area inside the chamber is, in fact, tall enough to hold the Statue of Liberty (pedestal excluded).There is only one natural entrance into the chamber in the form of a 30-foot vertical chimney dropping into the center of the room.This does make commercial entry a little difficult so dynamite was used in the mid 1800s to expand a natural crack in the ground wide enough for stairs to be built down.