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Hezekiah's Tunnel, or the Siloam Tunnel is a tunnel that was dug underneath the Ophel in Jerusalem about 701 BC during the reign of Hezekiah. It was probably a widening of a pre-existing cave and is mentioned in the Bible.

The tunnel^[1], leading from^[2] the Gihon Spring to^[3] the Pool of Siloam, was designed to act as an aqueduct to provide Jerusalem with water during an impending siege by the Assyrians, led by Sennacherib. The curving tunnel is 533m long, and by using a 30 cm (0.6%) gradient altitude difference between each end, conveyed water along its length from the spring to the pool.

According to an inscription (the Siloam inscription) found within it, the tunnel was excavated by two teams, one starting at each end of the tunnel and then meeting in the middle. The inscription is partly unreadable at present, and may originally have conveyed more information than this. It is clear from the tunnel itself that several directional errors were made during its construction^[4]. Recent discoveries concerning a related tunnel - Warren's shaft - have suggested that the tunnel may have been formed by substantially widening a pre-existing natural karst.

The ancient city of Jerusalem, being on a mountain, is naturally defensible from almost all sides, but suffers from the drawback that its major source of fresh water, the Gihon spring, is on the side of the cliff overlooking the Kidron valley. This presents a major military weakness as the city walls, if high enough to be defensible, must necessarily leave the Gihon spring outside, thus leaving the city without a fresh water supply in case of siege.

The Bible records that King Hezekiah (c. 8th century BC), fearful that the Assyrians would lay siege to the city, blocked the spring's water outside the city and diverted it through a channel into the then Pool of Siloam^[5]. However, it is now known (as of 1997) that the earlier Warren's shaft system had already heavily fortified the Gihon Spring^[6]; Warren's shaft is not an aqueduct, and requires those desiring water to travel up and down it themselves - an arrangement that Hezekiah seemingly must have considered inadequate.

In 1899, another tunnel, also leading from the Gihon Spring to the Siloam Pool area, but by a more direct route, was found. This latter tunnel is now known as the Middle Bronze Age channel, on account of its estimated age; Reich determined that it was constructed around 1800 BC (in the Middle Bronze Age), and thus that the spring's water had already been diverted many centuries before Hezekiah. It is essentially a 20 feet deep ditch in the ground, which after construction was covered over by large rock slabs (which were then hidden in the foliage). It is narrower, but can still be walked by a human for most of its length. In addition to the (3ft high) exit near the Siloam pool, the channel has several small outlets that watered the gardens facing the Kidron Valley^[7]. Hezekiah's tunnel in effect acts as a replacement for this channel, the ability for an assailant to discover the roof slabs being a weak point.

Hezekiah's tunnel, discovered in 1838 by the American biblical scholar Edward Robinson, can be walked through today from end to end.

The Bible verses relating to Hezekiah's tunnel are these:

"And the rest of the acts of Hezekiah, and all his might, and how he made a pool, and a conduit, and brought water into the city, are they not written in the book of the chronicles of the kings of Judah?" 2 Kings 20:20

"And when Hezekiah saw that Sennacherib was come, and that he was purposed to fight against Jerusalem, He took counsel with his princes and his mighty men to stop the waters of the fountains which were without the city: and they did help him. So there was gathered much people together, who stopped all the fountains, and the brook that ran through the midst of the land, saying, Why should the kings of Assyria come, and find much water?" 2 Chronicles 32:2-4

"This same Hezekiah also stopped the upper watercourse of Gihon, and brought it straight down to the west side of the city of David. And Hezekiah prospered in all his works." 2 Chronicles 32:30

Interior of Hezekiah's Tunnel. June, 2007.

• Siloam inscription
• Warren's Shaft
• List of Caves

• The Siloam TunnelAqueduct in the Jewish Encyclopedia
• Hezekiah's tunnel BiblePlaces.com article containing photos & links

1. ^ [1]
2. ^ Image
3. ^ Image of exit
4. ^ Images of some mistakes - [2] [3]
5. ^ [4]
6. ^ image of the (remains of the) fortifications
7. ^ Images of the Middle Bronze Age channel

• Brisco, Thomas C. (1998). Holman Bible Atlas. Nashville: Broadman & Holman Publishers. ISBN 1-55819-709-5.