Here's how the world's largest non-nuclear bomb, the guided Massive Ordnance Penetrator, could go deep underground and shake up Iran's Fordow nuclear fuel-enrichment facility.

With tensions escalating between Israel and Iran, the focus has shifted to one of the most heavily guarded sites in the Islamic Republic: the Fordow nuclear facility, buried deep within a mountain.

Brian Castner is a former explosive ordnance disposal officer who served in the Air Force during the Iraq War.

Modern warfare does not always rely on massive missile strikes or high-profile attack drones that can drop their own precision bombs. Sometimes, it's the precision of guided bombs that does the job.