Hi, a long time ago, while flipping channels, I crossed what was probably a documentary on whales. All I remember was an underwater shot of about 3 or more whales that were motionless and vertical. I suppose they were resting somehow. I tend to believe they were sperm whales, but I could be wrong. I am looking for more info on this behavior (how often, how long, why, etc.), and pictures if possible, as it was quite impressive visually. Thx.