A small Ushuaia agency best known for its lakes day: 4x4 out to Lago Escondido and Fagnano, with canoes in summer and snow driving in winter. It also sells the Laguna Esmeralda trek, the national park and the train, the penguins, and a longer run up the Atlantic coast to Estancia Cabo San Pablo.
Their site labels this number "WhatsApp guardias", and it is the one the tourism secretariat's register lists for them. The office is an upstairs flat on Deloqui; ring bell 30.