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It is the superb corridor located exactly under the cables of the Petites Rousses tram. Steep slope route with a difficult entry (snow accumulation).
From the summit of the Petites Rousses tram (Vaujany sector), descend a gentle slope towards the north for approximately 100m then go up a bump on the left (NW) to reach a long undulating croup which descends towards the NW. At the end of this croup, traverse to the left (SW) on Plateau de la Platte. Skirting the rocks which border this broad rather gentle slope on the right, you can easily find the entry of the narrow and steep corridor, which dominates the Rousses piste.
Variant (easier and less exposed): You can leave Plateau de la Platte further to the south (traversing all of it diagonally) via a small corridor to the S bordered by tall rocks on the right bank.