What makes narwhals so unusual?

Answer 1

One achievement that makes Narwhals quite unusual is their deep diving abilities. In fact, they are the perpetrators of the deepest known dives by marine mammals. They easily dive down 800 meters/2,400 feet, at least 15 times a day. They even have been known to dive 1,500 meters/4,500 feet downwards, and to stay down at almost half an hour at a time.