A landmark United Nations treaty governing the high seas has entered into force on Saturday (Jan 17), reshaping how international waters are protected and managed. For Southeast Asia, the new pact brings new opportunities and challenges. BANGKOK: For as long as time, the deepest, darkest and most mysterious corners of this blue planet have largely stretched beyond the reach of international law.  The biodiversity and resources of the high seas - from migratory fish stocks and largely unexplored