Whales live in the water, but they are not fish. the are mammals, and they cannot stay under water for too long. Blue whales can dive for an hour, to a depth of 105 meters, but they need to come to the surface to breathe. When they come to the surface, they blow a wet stream 8 to 10 meters up in the air.
Blue whales are the loudest animals on earth. Their call is louder than a jet, and it can travel for hundreds of miles in the ocean. They use their calls and songs to communicate with other blue whales.