English: Schematics of three kinds of thermal coring ice drill. From left: (a) open top core barrel, drills in meltwater; (b) removes meltwater and stores in chamber above core; (c) uses ethanol as an antifreeze and circulates the drilling fluid. Redrawn from Zagorodnov, V.; Thompson, L.G. (2014). "Thermal electric ice-core drills: history and new design options for intermediate-depth drilling". Annals of Glaciology. 55 (68): 322–330. doi:10.3189/2014AoG68A012, p. 324.
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