Whales find their way around by using a mental map of the sea floor which is based on sound.
Scientists have found that whales spend a lot of their time singing to each other, and the sound is bounced off the seabed and back to other creatures.
But the fact that the sounds are in water means there is a special 'whale time delay' because the sound takes longer to travel.
Scientists at a US university have spent nine years studying whale song.
The research team is using the same equipment that used to be used to track Russian submarines, but now it's following blue, fin, humpback and minke whales.