Quote (AEtheric @ Oct 8 2010 05:43pm)
The only problem I have with this conclusion is that we have found no evidence of advanced ancient technology used to build these bombs or other technological feats. If they knew how to build atom bombs then why were they still using clay pots and sun-dried brick houses?
Well obviously this ancient Indian city was in a valley so they were isolated from the outside world, and the nuclear weapon they built was so powerful that it completely annihilated everything that was in that valley that could have given evidence of any technology at all. At the same time, everyone knows that clay pots and sun-dried brick houses are more durable than nuclear weapons technology, so that's why there is still evidence of them in that city.
aka, ZvLoD is probably right. It was just a meteor that contained radiation which dispersed around the city on impact. You don't need a nuclear reaction in order to make a mushroom cloud, after all, so if someone had seen it that was outside the range of the blast, it's no surprise that what they described was a mushroom cloud.