Israelis have a plan for that in Gaza. https://www.scientificamerican.com/article/as-israel-floods-gazas-tunnels-with-seawater-scientists-worry-about-aquifer-c

Israelis have a plan for that in Gaza. https://www.scientificamerican.com/article/as-israel-floods-gazas-tunnels-with-seawater-scientists-worry-about-aquifer-contamination/ https://www.scientificamerican.com/article/as-israel-floods-...