The islands Waigeo and Gam are separated by a passage through which the water rushes depending on the tides in both directions. It actually makes you feel like diving in a rapid-water river. The riverbanks are covered with dense jungle and from below you can see the foliage and the blue sky above you. Fortunately there are several bays and big boulders where the water is calm and where the bottom is covered with purple soft corals and colonies of sea squirts. At some spots orange coloured gorgonian fans nearly reach the surface. In the branches of sunken jungle trees cardinal fish swim around and just below the surface we watched archer fish looking for prey on the foliage of the trees.
Some schools of bigger fish such as jacks, tuna, barracuda and sharks have been spotted here.