The prison i was talking is not the one under the lighthouse. That one is part of the core/root submachine.
The prison submachine is the one of Submachine: FLF.
It was before a mansion, but when the defense system has been created, the sub-bots and the subnet self transformed it on a prison, where the humans founded by sub-bots are prisoned.
All this is just an idea, it isn't exist none note about this submachine.
Side note: I wonder if it was Henry O'Toole's mansion.
