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This is what happened to me just now.
I was playing as normal my C1, Just watching over my Gen16
Norn and out of the blue, I saw the ocean mover underneath (that one that goes forth and back in the glass tunnel with the broken shee statue (Statue of nornity?) suddenly come moving left in the temple area,with the helicopter thing toy and all the way to this area (I stopped it here,since I didn't want it to crash my game)

I know it have happened to me before for many years ago,
but that one I let just go to see where it would went and
it crashed my game as soon it hit the shower area.
So thats why I took action and tried to click and see if I could
prevent it to move any further.
I recorded this happening from the time I spotted it and til I
stopped it from moving. Cant share my video clip here,but a screenshot is enough.

So,now I am stuck with this mover,not feeling like restarting my world,So I guess Im stuck with it...
Unless anyone knows a way to remove and inject it back to its place. I have seen there is a submarine fix cob,but nothing for this
mover. Someone would perhaps maybe make one,because that would be useful. I doubt it only happens me now twice.