These tunnels sound as if they’re much larger than 40”, 40 inches ? Fourty inches is enough to convieniently crawl through. These sound like you can drive through some of them. Like to see some pix on how big these things are.
What the IDF should be doing and hope are, is disabling the equipment used to construct them and sinking every ship load of concrete or construction equipment use to build them comming in there.
Not 40 inches but 40 tunnels ... :-) ...