The fourth level is the deepest and leads into a rectangular tank 9.5 m by 9.4 m, at a depth of 23 m. The well is located at the westernmost end of the property and consists of a shaft 10 m in diameter and 30 m deep. The building itself measures 64 meters by 20 meters.

Below the last step of the step well, there is a gate that leads to a tunnel 30 kilometer long that opens at the town of Sidhpur near Patan. It was built as an escape gateway which could be used by the king in the event of defeat during a war. The tunnel is now blocked by stones and mud.

In the 13th century, geotectonic changes lead to massive flood and disappearance of theSaraswati river, following which the stepwell ceased to function as a water well. Above all, it buried the property under several layers of slit for almost seven centuries. It was the silt carried by the flood caused during this historic event, which allowed for the exceptional preservation of Rani-ki-Vav, until it was discovered less than 30 years ago.

Rani ki vav was included in the list of UNESCO's World Heritage Site on 22 June 2014.

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Sources: UNESCO / Wikipedia