Hezekiah's Tunnel (also called the Siloam Tunnel) is a 1,750-foot (533-meter) water channel hewn through solid rock beneath the City of David in Jerusalem. It was constructed during the reign of King Hezekiah (approximately 701 BC) to bring water from the Gihon Spring to the Pool of Siloam, inside the city walls.
The tunnel is described in 2 Kings 20:20 and 2 Chronicles 32:30, which record that Hezekiah 'made a pool, and a conduit, and brought water into the city' in preparation for the Assyrian siege under Sennacherib. The engineering feat involved two teams of workers starting from opposite ends and meeting in the middle — an achievement recorded in the Siloam Inscription, discovered in 1880, which describes the moment the two teams heard each other's pickaxes through the remaining rock.
The Siloam Inscription is one of the oldest known Hebrew inscriptions and is written in the paleo-Hebrew script consistent with the eighth century BC. It is currently housed in the Istanbul Archaeological Museum.
The tunnel remains one of the most impressive engineering achievements of the ancient world. Its construction confirms the biblical account of Hezekiah's defensive preparations against Assyria and demonstrates the historical reliability of the Kings and Chronicles narratives. The tunnel can still be walked through today by visitors to Jerusalem.