Hezekiah's Tunnel and the Siloam Inscription

The tunnel itself remained known and traversable long after antiquity, but the inscription came to scholarly attention in 1880 when it was noticed on the wall near the Siloam end. It occupied a prepared, recessed panel about six meters inside the tunnel and was written above the ancient water level. In 1891, people attempting to remove it broke the inscribed face into pieces. Ottoman authorities recovered the fragments, and the restored inscription was taken to Istanbul, where it remains in the Istanbul Archaeological Museums. The separation of text and site now makes documentation especially important: visitors to Jerusalem can walk the tunnel, while the original inscription is elsewhere. Modern teams have surveyed the tunnel's route, tool marks, geological fractures, plaster, and water flow to understand how crews navigated underground. Scientific work sampled short-lived plant remains incorporated in the earliest plaster and carbonate deposits that formed after construction. These investigations complemented, rather than replaced, the traditional paleographic dating of the Hebrew letters.

The installation consists of a narrow, approximately 533-meter rock-cut channel that winds through the ridge from the Gihon Spring system toward the Pool of Siloam area. Its changing height and irregular course preserve evidence of hand excavation, geological constraints, and the meeting of work crews. The associated inscription is a rectangular panel of six surviving lines incised in paleo-Hebrew script. Its text describes the final cutting: workers approached one another, heard voices through the rock, broke through, and water flowed from the source to the pool. It gives a distance of 1,200 cubits and comments on the rock overhead. The inscription is anonymous: there is no royal name, divine dedication, date, or city name. That absence makes it unlike conventional royal building texts and directs attention toward the laborers and technical achievement itself. The original panel was damaged during removal and reconstructed from fragments.

Letter forms strongly resemble late Iron Age Hebrew, while the radiometric study dated organic material in original plaster and mineral growth associated with the tunnel to an Iron Age II range compatible with about 700 BC. The methods date construction materials and post-construction deposits, not a written royal signature. Historically, this was the period when Assyria dominated the Levant and Sennacherib campaigned against Judah in 701 BC. Protecting access to the Gihon water supply would have been strategically important for Jerusalem. Some scholars have proposed earlier phases or alternative purposes for parts of the water system, and paleography alone cannot deliver a single regnal year. The best conclusion is compatibility with late eighth-century construction and later maintenance, not an inscriptional proof of commissioning by Hezekiah.