It is interesting that A pushpaka Vimana can be the size of an aircraft Carrier or Mothership in Space

I hadn't heard of a concept like this that goes this far back into history before since Brahmanism is over 10,000 years old and likely the oldest form of Religion still in existence today through Hinduism. The Indus Valley was very developed even 10,000 years ago when basically no other culture on earth was likely at that time.

However, 12,000 years ago the Last Ice age was slowly melting off of earth and ocean levels were at least 400 feet below what they are now here on earth. So, there were land bridges between the U.S. and Asia then like where the Aleutian Islands are now and various other countries and islands were much bigger than now.

But, then the ice age ice which was 100s of feet high melted and left places like Yosemite Valley and Glacier National Park and places like this various places all over earth. And when this ice all melted it flowed to the seas and rose the level of the oceans 400 feet and likely flooded many cities at the ocean around then world between 12,000 years ago and the 20th century too. So, especially cities where oceans and rivers met would have been inundated by the rising ocean waters between 12,000 years ago and the 20th Century.

So, we shouldn't be surprised if sea levels rise 15 or 20 feet this century and put places like Venice and Miami and New Orleans and other places underwater as well as many islands around the world.