The IDF is turning those tunnels into graves even as people casually scan this thread. They are searching for heat signatures and evidence of activity by air, and roto-tilling the ground with high explosive tipped penetrator warheads, disrupting tunnel systems, generators, safe houses, and infrastructure, and won’t stop until nothing is left.
Of course they are doing so. If they weren't it would be military mal-practice.
I've spent a few minutes watching live video from Gaza with audio. When I hear the jets that usually means bunkerbusters are coming up shortly.
The detonation of a bunkerbuster has a particular visual signature. Sort of like you see from an explosion inside a tunnel. And the sound is more thump than boom.