Who came to india first?

As per kashyap purana India was actually discovered by the sage kashyapa the name of Kashmir has driven from the ‘kashyap mira’. He invited the asian tribe ‘naga’ (fat Asians like Japanese sumo fighters, who look beautiful if reduce their weight) and no body knows since when these two tribes were living in the sub continent. Now here is one more fact that in ancient time there was no India and most of the part of this place which is now known as India were actually empty and low level area of India and south east asia were known as patal, and the naga tribe used to live here, till now a lot of Indians have asian features. Till now the naga people live in the eastern state called nagaland but now hardly 10-15% of there population looks like Chinese and Japanese, rest are dark and follow the tribunal culture.