Seems to me that all the Israeli’s have to do is advance as far as the tunnel entrances on the Gaza side and detonate them.
The news reports from the IDF and Netanyahu’s office says that at this time the IDF is advancing no further than about four kilometers across the border.
Bulldoze every standing building , detonate not only the tunnels but any water , sewer or buried utility .. make a wide uninhabitable zone ... give them an ultimatum .. and mean it.
Precise bombing with bunker busters should work. They seem to have good intel on ground.