The Babylon Garden was an ancient space ship that brought the ancient Babylonians to Mobius after it crashed landed over a millennium ago. They discovered that the warp-drive that allowed the ship to travel easily in space had malfunctioned, and using it in this state would create a black hole, destroying the planet in its wake. The Garden's systems, detecting the malfunction, would automatically attempt to travel back to its point of origin for repairs. Not wishing to cause this destruction, the Babylonians removed the ingition matrix's components to prevent the system's reactivation. The Gravity Ring ended up being past down to the Battle Kukkus and the Key was hidden under the Gigan Mountains, protected by Angelus. (SU: #33, #34, #36)