I actually went on this tour way back on June 7th but as usual I haven't really had time to type this up. I went on this tour with Christina and Annie they have both finished their studies at Rothberg. Some of the pictures are a little blurry because the light conditions aren't so great and my camera didn't always want to cooperate.
To refresh your memory the story of King Hezekiah is told in 2 Kings chapters 18, 19, and 20. King Hezekiah is also mentioned in 2 Chronicles chapters 29-32.
The Gihon spring was the only source of water for the ancient city. Sennacherib the King of Assyria was coming because Hezekiah had stopped paying his taxes and was in open rebellion. This was the Assyrian army that just a few years earlier had taken the northern kingdom of Israel and sent them into exile. That mighty army was coming for Jerusalem. You can imagine the fear this must have caused. They had some time to prepare. One thing you have to do is protect your water source otherwise the enemies could use it or foul it up so you can't use it. Hezekiah decided to hide the Gihon spring by having a tunnel dug to bring the water inside the city walls. The tunnel was made by two digging teams starting from opposite ends and they met in the middle.