The law of the sea is a great laboratory for observing the fabric of international law through the interactions between a variety of judicial bodies with jurisdiction to interpret and apply the same legal rules and principles. As it is widely known, the United Nations Convention on the Law of the Sea (UNCLOS) establishes in Part XV a system of compulsory, albeit flexible system of judicial settlement of disputes. The dispute-settlement mechanism of UNCLOS thus contains a built-in potential for disorder or inconsistent development of jurisprudence. Significantly, the debates on the fragmentation of international law of the mid-2000s focused inter alia on the UNCLOS machinery of dispute settlement. Yet, far from resulting in divergent solutions, the multiplication of judicial fora is a chance for cross-fertilization and progressive development. Previous decisions are referred to and imported as a source of law. They constitute an acquis judiciaire that speaks fois the unity of the system.