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The unstable cave is part of the Toha Heavy Industries complex. Time and space are unstable and always change in this space due to the Gravity Reactor of Toha Heavy Industries. Like many things, Killy's the Gravitational Beam Emitter doesn't work most of the time and unpredictable in others.

Gravity reactor1

Gravity Reactor

First Killy got there by entering Mensab's Forwarding. He was sent 10 years forward into the future and met an alternative version of Cibo from another time line. together they ran away from Silicon Life until were saved by the "original" Cibo in Sanakan's body.

They are set to pause the Reactor by shooting it using Cibo's Anti Magnetic Cocoon, which allow Killy's GBE to operate.