We took the train and bus to Elm Station, where we started our hike. It's a 10 km hike, with about 1900 elevation meters.
We first went up to Tschingelenalp, then continued toward Segnespass. At about 2370 m asl we are heading towards Martinsloch. At first, there is no path. The closer we got to the rubble, a trail appeared. There is some protection, not everything is very solid. On the grisons side, we had after the travers to descend/slide through rubble... there was not really a sign of a trail.
From the flat, we headed up to Segnespass, where there is a mountain lodge, where we stayed for the night.