>

Ukraine knows all the entries to those tunnels, they have guided ammunition to blow them up, I don't understand why people think that Russia would be safe by trapping themselves into that kind of hell.
I don’t envy the fight that’s about to come.
Tunnel warfare is no joke. 
You’re deep underground, less clean air, fighting in darkness (if power to the lights is turned off) - worse if you lose your sense of direction, plus all the deafening sounds from gunfire and explosions, amplified lethality from grenades, little to no cover/restricted movement.
These salt mines are supposedly massive with several entrances/routes. You could be outflanked and not see it coming. >

Why do they have to fight in the tunnels?  Russia can just work to encircle the mine.  And the tunnels probably aren't accessible to resupply easy. It makes no sense to post up in the tunnels here. This isn't Vietnam. >

I heard that Russia may want to use the mines as an ammo depot. Not sure how accurate that is though. >

The only safe place from HIMARS?