Hamas is well known for digging tunnels; there are miles of tunnels under their southern border between Gaza and Egypt. Both Tel Aviv and Jerusalem are about 45 miles. Iran is spending thier nations wealth to build a U-235 bomb with no conventional delivery system. Do you suppose that tunnels are that? Remember in WWII we used a Uranium bomb in war after only testing the Plutonium device. I hope someone else is thinking of this. A-bombs under Israel would quickly result in H-bombs over Muslims and Mecca would be in great danger.