Technique for improving core quality in intermediate-depth ice drilling

A hot-water ice-coring drill

“…High-quality ice cores with few fractures can be assured by using core liners for confinement during the relaxation process after drilling. Morgan and others (1998) have shown that a small confinement pressure can improve core quality considerably. This is why the ice cores from hot-water drilling, reaching the surface in the plastic core barrel, are mostly intact.…”