Inaccessible chambers in PC TNT level 03, POWER CONTROL:

On this level there are 3 tiny chambers that are normally
hidden and sealed shut in single-player mode: One on the
north edge of the map, and two others branching from the
short tunnels leading to the eastern-most and southern-most

These are normally accessed only in Cooperative games, via
a special set of invisible one-time teleporters, arrayed
just ahead of the first teleporter pad at the start of the

Hope this helps. :)

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