What are u talking about ? Who ever laughed at life in the oceans ?? Who couldn't see a fish or a jelly fish ? A blind human ?

many things are possible; we can only deduce what is likely based on what we know while admitting that we don't know everything (not even close). but we have observed fire and it is VERY unlikely that life as we know it thrives inside of fire.

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We didn't need to go underwater to know that there was life there, because we can see it. We can also see many animals which don't live underwater but have evolved to hunt for food there. We cannot see anything living in fire, nor do any animals hunt in it. That's without even considering the facts that fire is a very difference environment to water and rarely lasts long enough for anything to evolve to live in it.