Why They're Dangerous: With the power of millions of pounds of ice cracking and being forced upward, water often leaks to the surface creating large slushy areas that can weaken the ice. Avoid the slushy areas or you could get your machine stuck and soak your boots. Often, in areas where the ice has separated by more 2 two feet, only an unassuming, thin layer of snow covers them. If you're not careful, you can go through the ice. In some areas along a pressure ridge, ice has been forced down and water has seeped up from the lake covering it over. In areas like this you will get two layers of ice. If the crack happened recently, the top layer of ice may only be an inch or two thick and the bottom layer could be eight feet below it. It's best to stay a safe distance away from them while following their route.