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Radiometric dating of the Siloam Tunnel, Jerusalem


The historical credibility of texts from the Bible is often debated when compared with Iron Age archaeological finds (refs . 1, 2 and references therein). Modern scientific methods may, in principle, be used to independently date structures that seem to be mentioned in the biblical text, to evaluate its historical authenticity. In reality, however, this approach is extremely difficult because of poor archaeological preservation, uncertainty in identification, scarcity of datable materials, and restricted scientific access into well-identified worship sites. Because of these problems, no well-identified Biblical structure has been radiometrically dated until now. Here we report radiocarbon and U–Th dating of the Siloam Tunnel3,4,5,6,7,8,9,10, proving its Iron Age II date; we conclude that the Biblical text presents an accurate historic record of the Siloam Tunnel's construction. Being one of the longest ancient water tunnels lacking intermediate shafts11,12, dating the Siloam Tunnel is a key to determining where and when this technological breakthrough took place. Siloam Tunnel dating also refutes a claim13 that the tunnel was constructed in the second century bc.

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Figure 1: Location map.
Figure 2: Typical layering in a core drilled at the bottom of the Siloam Tunnel.


  1. Finkelstein, I. & Silberman, N. The Bible Unearthed: Archaeology's New Vision of Ancient Israel and the Origin of Sacred Texts (Simon & Schuster, New York, 2001)

    Google Scholar 

  2. Montgomery, J. A. A Critical and Exegetical Commentary on The Book of Kings (Scribner, New York, 1951)

    Google Scholar 

  3. Vincent, L. H. Underground Jerusalem: Discoveries on the Hill of Ophel (1909–11) (Horace Cox, London, 1911)

    Google Scholar 

  4. Amiran, R. in Jerusalem Revealed (ed. Yadin, Y.) 75–78 (Israel Exploration Society, Jerusalem, 1976)

    Google Scholar 

  5. Ussishkin, D. The original length of the Siloam Tunnel in Jerusalem. Levant 8, 82–95 (1976)

    Article  Google Scholar 

  6. Shaheen, N. The sinous shape of Hezekiah's Tunnel. Palestine Exploration Fund Quarterly Statement, January–June, 103–108 (1979)

  7. Gill, D. Subterranean waterworks of Biblical Jerusalem: Adaptation of a karst system. Science 254, 1467–1471 (1991)

    ADS  CAS  Article  Google Scholar 

  8. Abells, Z. & Arbit, A. The City of David Water Systems (Hadassah College, Jerusalem, 1995)

    Google Scholar 

  9. Mazar, A. Jerusalem's water supply in the First Temple Period. in The history of Jerusalem (eds Ahituv, S. & Mazar, A.) 195–232 (Yad Izhak Ben-Zvi, Jerusalem, 2000)

    Google Scholar 

  10. Reich, R. & Shukron, E. Reconsidering the karstic theory as an explanation to the cutting of Hezekiah's Tunnel in Jerusalem. Bull. Am. Sch. Orient. Res. 325, 75–80 (2002)

    Article  Google Scholar 

  11. Issar, A. S. The evolution of the ancient water supply system in the region of Jerusalem. Israel Explor. J. 26, 130–136 (1976)

    Google Scholar 

  12. Tsuk, T. Ancient Water Systems in Settlements in Eretz-Israel (Tel Aviv Univ., 2000)

    Google Scholar 

  13. Rogerson, J. & Davies, P. R. Was the Siloam Tunnel built by Hezekiah? Bibl. Archaeologist 59, 138–149 (1996)

    Article  Google Scholar 

  14. Sasson, V. The Siloam Tunnel inscription. Palestine Exploration Fund Quarterly Statement 114, 111–117 (1982)

    Article  Google Scholar 

  15. Della-Vida, G. L. in In Memoriam Paul Kahle (BZAW103) (eds Black, M. & Fohrer, G.) 162–166 (Topelmann, Berlin, 1968)

    Google Scholar 

  16. Hackett, J. A. et al. Defusing pseudo-scholarship: The Siloam inscription ain't Hasmonean. Bibl. Archaeol. Rev., March–April, 41–50 (1997)

  17. Shimron, A., Frumkin, A., Rosenbaum, J., Deutch, Y. & Dvoracek, M. The significance of geological structures, cave sediments and hydraulic lime in the interpretation of the subterranean waterworks beneath ancient Jerusalem. Geol. Surv. Israel Curr. Res. 12, 247–256 (2000)

    Google Scholar 

  18. Amit, D., Patrich, J. & Hirschfeld, Y. The aqueducts of Israel. J. Roman Archaeol. Suppl. Ser. no. 46, (Journal of Roman Archaeology, Portsmouth, Rhode Island, 2002).

  19. Hedges, R. E. M., Law, I. A., Bronk Ramsey, C. & Housley, R. A. The Oxford accelerator mass spectrometry facility: Technical developments in routine dating. Radiocarbon 31, 99–113 (1989)

    CAS  Article  Google Scholar 

  20. Bronk Ramsey, C. Radiocarbon calibration and analysis of stratigraphy: The OxCal program. Radiocarbon 37, 425–430 (1995)

    CAS  Article  Google Scholar 

  21. Stuiver, M. et al. INTCAL98 radiocarbon age calibration, 24,000–0 cal BP. Radiocarbon 40, 1041–1083 (1998)

    CAS  Article  Google Scholar 

  22. Kaufman, A. et al. U–Th isotope systematics from the Soreq Cave, Israel and climatic correlations. Earth Planet. Sci. Lett. 156, 141–155 (1998)

    ADS  CAS  Article  Google Scholar 

  23. Frumkin, A., Ford, D. C. & Schwarcz, H. P. Continental oxygen isotopic record of the last 170,000 years in Jerusalem. Quat. Res. 51, 317–327 (1999)

    CAS  Article  Google Scholar 

  24. Frumkin, A. & Shimron, A. in 11th International Conference on Water in Antiquity (eds Fahlbusch, H., Meshel, Z., Peleg, Y., Porath, Y. & Tsuk, T.) 4, (Tel Aviv University, 2001)

    Google Scholar 

  25. Frumkin, A. 9th Congreso International de Espeleologia 264–267 (Union Internacional de Espeliogia, Barcelona, 1986)

    Google Scholar 

  26. Gill, D. in Excavations at the city of David 1978–1985 (Qedem 35) (eds Ariel, D. T. & de Groot, A.) 1–28 (Institute of Archaeology, Hebrew University, Jerusalem, 1996)

    Google Scholar 

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We thank U. Piner (Israel Cave Research Center) for assistance during the initial survey; S. Ashkenazi and Y. Peled (Geological Survey of Israel) for performing the drilling programme; the Research Laboratory for Archaeology and History of Art, Oxford University, for radiocarbon dating; the Open University, Milton Keynes, for 230Th/234U dating; C. Doherty (plaster and mortar) and P. Pettitt (radiocarbon) and Y. Elitzur for discussions, and K. Allred for surveying a new map of the Siloam Tunnel. The National Center for Cooperation Between Science and Archaeology provided financial assistance. Israel Antiquities Authority and Nature and Parks Authority permitted the study.

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Correspondence to Amos Frumkin.

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Frumkin, A., Shimron, A. & Rosenbaum, J. Radiometric dating of the Siloam Tunnel, Jerusalem. Nature 425, 169–171 (2003).

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