A closer look at the world's largest fortified underground hospital in Israel

As the conflict in the Middle East escalates, NBC News' Raf Sanchez visits the world's largest fortified underground hospital in Israel as it prepares itself for retaliation from both Hezbollah and Iran.  » Subscribe to NBC News: NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features , , , Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows. Connect with NBC News Online! Breaking News Alerts: Visit : Find NBC News on Facebook: Follow NBC News on Twitter: https:/