glacier cave

   1. A cave carved out of the ice inside a glacier, not to be confused with an ice cave. Passages are formed by meltwater descending from the glacier surface via crevasses, or by melting on the glacier base. Through caves may connect sinkholes (sometimes called moulins) to glacier snout resurgences, but due to ice movement most glacier caves are ephemeral. The most extensively explored glacier caves were the Paradise Caves on Mount Rainier, USA, whose passages extended for many kilometers, before the glacier wasted away and the caves were destroyed [9].

   2. Cave in ice formed within or at the base of a glacier [10].