- P1
From the outlet of Lake South America go around the lake and up the scree to the left-hand end of the wall below Adelaide Saddle. Climb Gifford's Crack to a shoulder, then descend slightly to the right and up a gully to the Saddle. The traverse around Barrier Knob starts at a small col just before the North Ridge starts to steepen, about 200m above the Saddle. Gifford's Crack was spotted in January 1909 by A C Gifford who with his companions William Grave, Arthur Talbot and A Lyttle ascended to Adelaide Saddle in search of a route to Milford Sound. An alternative to Gifford's Crack is to climb the ridge on Sentinel directly above the outlet, or go to the northern end of the terraces above Lake Adelaide and take the slabs to the shoulder of Sentinel. This route crosses snow and ice under the Sentinel buttress which could break up mid summer.