The Abyss

The deepest part of the abyssal plain is over 5 times deeper than the height of the CN Tower!

Abyssal plains are the incredibly deep and extremely level regions of the ocean floor - the flattest places on the planet! The slow, smoothing motions of currents along the ocean floor contribute to the formation of these plains. They are surrounded by submarine ridges or by the edges of the continental shelves. Some of these flat regions reach depths of over 4,000 metres, and stretch for distances of more than 500 kilometres. The depth of the Arctic basin ranges from 2,500 to 4,400 meters; that’s at least 5 times the height of the CN Tower! The average depth of basins in the rest of the world’s oceans is only around 2,000 metres, although certain areas of the Pacific Ocean are the deepest points recorded. Until the middle of the 20th century, it was believed that the Arctic Ocean was comprised of one large flat basin. In the 1950s, however, scientists discovered that the Arctic basin is divided into two main basins, which are themselves divided into four smaller basins by submarine ridges.