There are currently ~6 active tunnels in Pence Kilit operation, those are really big tunnels we are talking about hundreds of meters in they literally carved up the mountains. Most of the Zap region is under TSK's control, which is restricting the movement of the terrorists, that's why they are playing for time in the tunnels and sporadically attack our troops, this usually happens with guidance of other "war tunnels" who can spot our besieging troops from the other mountains. ATGM attacks are not rare. Zap has the highest priority for the terrorists, it's the brigde to Metina and Amedi.
I think what TSK will do before winter retreat is cleaning some parts of the tunnels and then blow up the cleaned sections.