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The Siloam Tunnel ((ヘブライ語:נִקְבַּת השילוח), ''Nikbat HaShiloah''), also known as Hezekiah's Tunnel, is a water tunnel that was dug underneath the City of David in Jerusalem in ancient times. Its popular name is due to the most common hypothesis of its origin, namely that it dates from the reign of Hezekiah of Judah (late 8th and early 7th century BCE) and corresponds to the waterworks mentioned in in the Bible. According to the Bible, King Hezekiah prepared Jerusalem for an impending siege by the Assyrians, by "blocking the source of the waters of the upper Gihon, and leading them straight down on the west to the City of David" (). Support for the dating to Hezekiah's period is derived from the Biblical text that describes construction of a tunnel〔 and to radiocarbon dates of organic matter contained in the original plastering. However, the dates were challenged in 2011 by new excavations that suggested an earlier origin in the late 9th or early 8th century BCE.〔〔 The tunnel leads from the Gihon Spring to the Pool of Siloam.〔(Image of exit )〕〔(Holy Land Photos )〕〔(Image )〕 If indeed built under Hezekiah, it dates to a time when Jerusalem was preparing for an impending siege by the Assyrians, led by Sennacherib. Since the Gihon Spring was already protected by a massive tower and was included in the city's defensive wall system, Jerusalem seems to have been supplied with enough water in case of siege even without this tunnel. According to Ahron Horovitz, director of the Megalim Institute, the tunnel can be interpreted as an additional aqueduct designed for keeping the entire outflow of the spring inside the walled area, which included the downstream Pool of Siloam, with the specific purpose of withholding water from any besieging forces. Both the spring itself, and the pool at the end of the tunnel, would have been used by the inhabitants as water sources. Troops positioned outside the walls wouldn't have reached any of it, because even the overflow water released from the Pool of Siloam would have fully disappeared into a karstic system located right outside the southern tip of the city walls. In contrast to that, the previous water system did release all the water not used by the city population into the Kidron Valley to the east, where besieging troops could have taken advantage of it. The curving tunnel is 533 m long, and by using the 30 cm altitude difference between its two ends, which corresponds to a 0.6‰ gradient, the engineers managed to convey the water from the spring to the pool. According to the Siloam inscription, 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.〔Images of some mistakes - () ()〕 Recent scholarship has discredited the idea that the tunnel may have been formed by substantially widening a pre-existing natural karst.〔 How the Israelite engineers have dealt with the difficult feat of making two teams digging from opposite ends meet far underground, is still not fully understood, but some suggest that the two teams were directed from above by sound signals generated by hammering on the solid rock through which the tunnelers were digging.〔 ==Discovery and interpretation== The tunnel was first described in modern times by Franciscus Quaresmius in 1625.〔 It was later explored in 1838 by the American biblical scholar Edward Robinson, and in 1865 by Charles Warren. Neither Quaresmius nor Robinson identified the tunnel with Hezekiah,〔 but in 1871 Warren suggested that the Pool of Siloam may have been "dug by King Hezekiah"〔(The recovery of Jerusalem, by Captain Warren ), quote: "This latter I suppose to have been the pool dug by King Hezekiah"〕 and in 1884 following the discovery of the Siloam inscription wrote that: "The inscription thus appears to belong to the later period of the Hebrew monarchy, and may very well be considered to agree with the Biblical account of Hezekiah's preparations for Sennacherib's siege"〔(The survey of Western Palestine-Jerusalem (1884) p.348 ), Warren and Conder〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Siloam tunnel」の詳細全文を読む スポンサード リンク
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