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Anti-Submarine Weapons - The State of the Art

Among the different sectors of naval warfare which underwent major changes after the end of the Cold War, Anti-Submarine Warfare (ASW) is certainly the most affected one. Nearly all the potentially hostile submarines belonged to Soviet Union, and when the latter disappeared very few boats were left in the worldwide inventory to be dealt with as potential threats. Moreover are a very complex tool, and not many navies belonging to potentially hostile nations in the so-called Third World were considered capable to deploy both technically and operationally such a force with a significant degree of effectiveness. Nearly twenty years after the fall of the Berlin Wall, what is the current and prospective future situation?