The Imagination about King of Nagas

I had inspiration from legend of Nagas in Thailand and imagine about it while I was swimming in a pool. Concept about Naga lives in the water (sea), when it exhales, breath become cloud in the water and made the sky in the water become a new underwater world. And the boy need to swim with Naga after he found the new world....(There are some temple on the new world that I'm not sure, where is that place)