El Aruk is a shallow dive with app. 10m-15m. Lots of smaller ergs need good navigation not to loose orientation in between them. Watch your compass and take care of the sometimes quiet strong current. The sandy bottom is the home of a lot of sweet lips and blue spotted stingrays. Hidden in the erg walls are glass fishes and smaller coral fishes. The most famous erg is the split erg El Aruk Macroom. His split is filled with glass fishes, lion fishes and a big grouper is living there.