Guardian: A dark intertwine of deep green fjords stretches beneath us towards the horizon where the confluence of the glacial current merges with the black stillness of the open sea. Far to the south, where epic waves torment Cape Horn’s cold granite cliffs, three great oceans – the Pacific, the South Atlantic and the Antarctic – meet in a cacophony of turbulent waves and deadly squalls. It is the stormy heart of the most unpredictable weather system on earth. “My Patagonia,” in the words of the poet …