[norwaypinesavage]

"Stupid is the only word that fits."

I second your opinion. Ridges such as those in the video are caused by shifting ice. It can shift at any time. Sometimes the ice goes up, some times it goes sideways, some times it goes down.

I met a fellow who almost lost his life because it went down. It left a big pool of water with a gently sloping ice bottom. He got trapped in it, and couldn't walk out because it was too slippery to walk up the slope. Fortunately, he was able to yell and attract rescuers before he died of hypothermia.

[Lakeshark]

FYI, I watched those ridges being formed, and they weren't caused by shifting ice. They were caused by the ice forming in the shallow rock bars at the end of where the water drops off, then the winds took 33 degree water and splashed on top of the edge forming into higher and higher little bluffs every day for a month. The water froze immediately in such cold temperatures as it hit the edge, the winds were high for the better part of a month preventing the main lake from freezing, so the edge bluffs kept getting bigger.