Large Collapse at Lionhead

We rode below Lionhead Ridge via Denny Creek and found a snowpack with the worst structure we've seen in our forecast area. There was around 3 feet of snow on the ground between 8000-9000'. The bottom foot was sugary weak facets, and the upper snowpack was a supportable hard slab with new snow on top (profile attached). 

We had two large collapses. The most significant collapse happened when we were leaving our snowpit and walking back to our sleds a few feet away. We heard a long "whumph" sound and saw our snowmobiles drop an inch, as the snowpack on the entire slope around us collapsed. Our snowpit had ECTP23 x2 breaking on the sugary weak layer.