"The American biologist Roger Payne has calculated the there is a deep sound channel in the ocean… through which two whales could communicate with each other essentially anywhere in the world... through most of their history the whales seem to have established a global communication network. What two whales might have to say to each other separated by 15,000 kilometers I haven't the foggiest idea but maybe it's a lovesong cast into the vastness of the deep"

Carl Sagan - The Cosmos, The Persistence of Memory, 1980