Inside the west entrance of West Ice Cave, a lava tube located in a deep collapse pit south of Medicine Lake, California.  The cave starts w/ a crawlway into a room w/ a level ice pond that has some floating liquid water on top.  Past a squeeze through two large breakdown boulders is where the ice drops into a frozen slide a good 15 feet down before sloping additionally further down, reminding me a bit of Crystal Ice Cave in Lava Beds National Monument.  A rope was handy to have as well as microspikes - there is no other exit once you descend.  The rope I tied to a leftover chain - an old chain ladder led the way down but it was already long buried under a foot of ice.  The ice here has accumulated for centuries I would imagine as I cannot see the breakdown floor below.  This view is further in where there are some lovely formations coming from the ceiling, almost like a limestone cave as they are 10-12 feet in height.  A photo I found taken about 50 years earlier indicates that the ice floor has risen nearly two feet w/ these hanging ice formations changing every season.  A massive wall of ice completely chokes the passageway as seen about 100 feet further.