The present-day Wailing Wall is only one of the four walls that once enclosed the city. Only the western wall has survived to this day and, in fact, we see only part of its 15-meter-high structure - another 12 meters of the wall are hidden underground. Along it and beneath the buildings of the Old City runs an underground tunnel, which archaeologists discovered only quite recently. Presumably, it was used to secretly leave the city in the event of an attack by invaders. In addition, a large drain was found in the northern part of the tunnel - further evidence of how well thought out the construction was, and how advanced the civilization was. In case of flooding, the city was in no danger, as the water simply flowed downward and was carried away through the drain.
In terms of width and height, the tunnel is very uneven. In some places the passage is so narrow that only one person can fit through, while in others there is an entire hall, spacious and with high ceilings. One of the attractions of this passage is a gigantic stone (length 13,6 m, approximate width - from 3,5 m to 4,5 m). It weighs 517 tons - almost 35 times more than the heaviest stone of the Egyptian pyramid! What is amazing is that the stone is monolithic, its surface is astonishingly even, and it is hard even to imagine that 2,5 thousand years ago people moved it without special equipment.
