I came to work in the region during the winter, quite obviously, the lake was frozen, inaccessible and covered by a thick layer of snow. First time going to a high mountain in my life, lesson learned. The next summer, back to work in Chamonix after lockdown, I tried to go in June, but the lake was still frozen and I had to wait a few additional months. I could have been in July/ August, but being way too crowded for me, I waited a little bit longer... See more