A team of scientists from the SETI Institute, University of California Davis and the Alaska Whale Foundation, had a close encounter with a non-human (aquatic) intelligence. The Whale-SETI team has been studying humpback whale communication systems in an effort to develop intelligence filters for the search for extraterrestrial intelligence.
Maybe not in Atlantis, but it really is possible that right now that humpback is telling his buddies “I swear, I was swimming along and heard someone saying hello, and when I looked over it was a boat!”