Montenegro. In the former Yugoslavia numerous submarine bunkers were built at the Adriatic coast during the occupation by the Germans in the Second World War. Further submarine bunkers were built by the Yugoslav army during the Cold War. The bunkers were used by the Yugoslav army for almost fifty years. Now most of the bunkers on the Adriatic coast have been abandoned. Some of them are open to tourists and sometimes it is even possible to swim or dive in the submarine bunker. For example in Montenegro, in the bay of Kotor. It is an absolutely unique dive site. (Cover photo by Dr. Till Pasquay)