The coral reefs in the deep waters outside Ålesund have many things in common with the the coral reefs in shallow, waters. They are constructed by stone corals and are the habitat for a fantastic animal life. The stone coral Lophelia pertusa.

Along the rims of iceberg ploughmarks, there are good conditions for the coral reefs. The bottom is hard, and the currents bring food to the corals. The corals have grown for several thousands of years. You can also find other corals like (sjøtre, risengrynskorall, og sjøbusk som danner korallskoger).