This room is simply, as the name implies, the entrance to the Gel Cavern. Several odd structures that have Fuel Gel growths descend from the ceiling, which make passage difficult. The first time Samus enters this room, she will find four Hoppers in this room. If Samus comes back to this room, a single Pirate Trooper can be found in this room. If Samus comes back to this room after destroying the Leviathan on Bryyo, she will once again find four Hoppers in this room.