Photos here - https://www.generationword.com/jerusalem101/25-hezekiah-tunnel.html Hezekiah's Tunnel was cut through bedrock in 701 BC under the City of David, curving and weaving for 1750 feet. If the same tunnel were cut in a straight line, itwould be 40% shorter at only 1070 feet. Cut to bring water from the Gihon Springs in the Kidron Valley located on the east sideof the Eastern Hill outside the city's walls, through the bedrock of the Eastern Hill to the west side, where Hezekiah's city of Jerusalem was expanding andprotected by the new Broad Wall.After all that Hezekiah had so faithfully done, Sennacherib king of Assyria came and invaded Judah. He laid siege to the fortified cities, thinking to conquer them for himself. When Hezekiah saw that Sennacherib had come and that he intended to make war on Jerusalem, he consulted with his officials and military staff about blocking off the water from the springs outside the city, and they helped him. A large force of men assembled, andthey blocked all the springs and the stream that flowed through the land. 'Why should the kings of Assyria come and find plenty of water?' they said.Then he worked hard repairing all the broken sections of the wall and building towers on it. He built another wall outside that one and reinforcedthe supporting terraces (Millo) of the City of David. He also made large numbers of weapons and shields. . . It was Hezekiah who blocked the upperoutlet of the Gihon spring and channeled the water down to the west side of the City of David."- 2 Chronicles 32:1-5, 30