On our planet we have found living organisms living in conditions we once thought impossible to support life lest than 10 years ago. We have yet to see a living giant squid but dead ones keep showing up from time to time. We have yet to see all the life on our own planet. We could have intelligent life here on this planet but simply lack the means to communicate with it or the other life might fear us. Just think about it. If a whale was a 100 times smarter than a human how would it communicate with or would it. What would it do? It can't making anything, it can't travel outside the ocean, it can't say my name is flipper and point to itself.
I have no doubt there is life on other worlds. Life that is vastly different from our own and life that is close to our own.
