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 ?

Did you know that the flame of a candle smells excately like burning nose hair?

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.