Around 701 BC, Jerusalem was preparing for the worst siege of its history.
The Assyrian army was coming, and the city's only water source, the Gihon Spring, lay outside the walls.
King Hezekiah's solution: carve a 533 meter tunnel through solid limestone bedrock, diverting the spring's water to the Pool of Siloam inside the city.
The residents would drink. The besiegers outside would find nothing.
2,700 years later, water still flows through it. And you can still walk it today, waist-deep, in the dark.
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