Chapter 94 - Vimanas and Guests From Kalinga

During the era of the Survanshi dynasty, aeronautics was so developed that there were flying puris (cities) equipped with all kinds of facilities. The tale of such three cities called Tripura was still narrated by sutas and sung by bards throughout Varta. The Tripura were three cities made of Indra gold,  Akashi silver, and Divya iron could travel in the sky, on the water, and on the earth.  They were ruled by the three brothers named Tarakaksha, Kamalaksha, and Vidyunmali. It was said Hara had destroyed all the three cities with an arrow shot by his self forged Astra called Pashupatastra. With them got destroyed all the knowledge of aeronautics. Because the three brothers had monopolized the knowledge of Vimanas and banned dwizas to pass down it to anyone else but a few chosen ones, which were none other than their own men.