Pressure ridges and leads in -50 degrees Celsius. Kolyma, Siberia. It was not a daily occurence. When it came to leads we could spot them miles ahead. Due to the nuclear explosion looking mushroom shooting up in the air. They never turned out to be a problem. And we reached the Ambarchik Bay and the East Siberian Sea early May, so the ice was solid and thick. As regards to pressure ridges, they constituted only a small part of the journey. And always in the middle of the river. The only time we had to cross them was when there were warmth and people on the other side. It was tough crossing them and if we would have had them every day, hard. Too much sweating involved and that always gave us and armour of ice beneath our last layer of clothes. And made them heavy and hellish once inside the tent. It was like taking armour off. Same with the facemask. Read more at https://www.mikaelstrandberg.com/wp-content/uploads/2009/10/Explorers_journal_winter_05_06.pdf