Great Tree Hall is a room in the Tallon Overworld in Metroid Prime. It has two levels: The first one is partially underwater. The upper level is blocked by a barrier controlled by a Spinner that is located on the bottom level. Samus first enters it from a door out of the crashed Frigate Orpheon. As the name implies, there is a tree in the center of the room which helps Samus reach a higher ledge that can allow her to open up an entrance to the Life Grove.