Point taken but Hamas are not the VC and Israel isn’t the US. Because of the Hamas tunnels Israeli troops are trained to deal with tunnels. I wouldn’t personally want to do that. I am sure that explosives, gas and yes, even water are tools available to them depending on the design and situation. Going in after them is also on the table.https://www.warhistoryonline.com/war-articles/vieg-cong-tunnels-vietnam-deadly-highly-effective.html
Any that were found were either “crimped” with explosives or had gas or water poured into them. However, it was soon found that these methods didn’t work.
The tunnels had been specifically designed to prevent water or gas from flowing through them and reduce the effects of explosives detonating inside. It wasn’t until Australian troops explored the tunnels that their full complexity and scale were revealed.
After this, the US changed its tactics for dealing with the tunnels; now troops had to search them by hand.
I don’t envy the Israeli soldiers.