Narwhals are deep divers

Narwhals are frequently observed making some of the deepest dives among marine mammals throughout the winter. They dive several times every day, preferring the deeper waters of the continental slope and Arctic fjords, where they may go to depths of up to 5,000 feet. Additionally known to frequent deep waters, Greenland narwhals have been observed by biologists to make daily dives deeper than 3,000 feet. A narwhal can submerge for up to three hours every day at a depth of fewer than 800 meters.

The fact that narwhals are so challenging to examine accounts for a large portion of their enigma. The shy animals inhabit environments that are gloomy and covered in ice for most of the year in some of the most remote locations on Earth. Between January and April, the Baffin Bay narwhals had less than 3% access to open water, with a minimum of 0.5 percent open water by the end of March. They are able to stay alive by finding tiny crevices in the ice where they can occasionally breathe while hiding.