These videos are so well done and informative! I learned a lot.
At around the 8:05 mark in the
Ismannaskap 3 video, the author describes how the forces of wind and sun together can cause large plates to separate and move even on a cold day, stranding skaters. A few of us experienced this phenomenon in January 2017 on outer Mallets Bay on Lake Champlain. That day, after we had skated from the inner bay out onto the outer bay, we heard a loud crack when the ice plate we were on broke away and began moving to the north with the wind, creating an uncrossable open gap between us and the inner bay where we had come from. Happily for us, after a nerve wracking skate away from the newly exposed open water (a wide-open seam just like in the video), we were able to get off the ice on the eastern edge of outer Malletts Bay (north of the opening to the inner bay) and walk along the shore beneath Red Rock Point to get back to the inner bay where we could enjoy solid ice all the way back to Bayside Marina.
The story in the video took place in Norway in February 2015. Some of those skaters had to be rescued by boat.