Fiordos del Sur is the navigation arm of the Lago Grey group, which is why every email address on the site ends @lagogrey.com. They run three boats and three routes: the FDS III out to the Isla Magdalena penguin colony from Punta Arenas, four hours for 100,000 pesos; the Grey III across Lago Grey to the face of the glacier inside Torres del Paine, three hours for 110,000; and the six-hour run up the Última Esperanza fjord from Puerto Natales to the Balmaceda and Serrano glaciers in the Bernardo O'Higgins park, 120,000.
It is the cheapest published Magdalena crossing of the three operators here, and the shortest. The one-hour limit ashore is CONAF's, not theirs, and applies to everybody.
They publish two landlines and two email addresses and no WhatsApp at all.