“Pretty light on details. I guess we’ll see what occurs.”
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I take everything that comes out of there (from both sides) with a shaker full of salt. I suspect that if the Russians actually have entered the grounds of the steel plant it’s MERELY TO GET CONTROL OF THE SURFACE OF THOSE GROUNDS to cover the entrances/exits for the tunnels. They have no NEED to actually go into the (now) very smelly tunnels.
Entering the tunnels sounds unnecessary and a good way to die.
If the Ukrainians built bunkers six levels deep, I would suspect they have tunnels extending far outside the steelworks.