This was mentioned in Cosmos. Time was when whales could communicate flawlessly almost around the entire circumference of the earth. Then human sea travel, espe

This was mentioned in Cosmos. Time was when whales could communicate flawlessly almost around the entire circumference of the earth. Then human sea travel, especially motor-powered ships, basically acted as a really loud fan that makes it hard to communicate over. So yes, they can stil talk over long distances, but the difference is between the ability to call someone on the phone, and jury-rigging one with two cups and a string.