The NOAA (National Oceanic & Atmospheric Administration) has produced a short video with the conclusions from recent research into the effects of extraneous (i.e. non-natural) noise on the habits of whales. The cooperative project involved a number of organisations including the BMMRO and Florida State University and lasted two years.
The study concentrated on beaked whales, pilot whales, and melon headed whales. Using readings from tagged whales, the scientists created animations showing the whales behavior before, during, and after being exposed to low levels of a variety of sounds; including sonar. The results showed that beaked whales, known for diving to extreme depths, were much more sensitive to sonar than other species. Even low levels of these sounds disrupted their diving, vocal, and likely feeding behaviors.
The complete report including a VIDEO and a transcript can be found by clicking LINK==> Sounds Under the Surface | Science and Technology | Ocean Today (I haven’t been able to embed the Video, so you’ll get the whole page)