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Creo 2? Yeah, I haven't seen that in a long time. Refresh my memory, what makes that layer show up again?
Dean,
If I am not wrong, this layer will create when you will hide something from model tree (e.g. Datum) and export (STEP). When importing that data, BLACK_HOLE layer will be there for hidden items as Creo will not export Hidden Layer.
Don't let it grow too big!