USS Glacier (AGB-4) (later
USCGC Glacier (WAG/WAGB-4)) was a U.S. Navy, then U.S. Coast Guard
icebreaker which served in the first through fifteenth
Operation Deep Freeze expeditions.
Glacier was first icebreaker to make her way through the frozen
Bellingshausen Sea, and most of the topography in the area is named for her crewmembers. When built,
Glacier had the largest capacity single armature DC motors ever installed on a ship.
Glacier was capable of breaking ice up to thick, and of continuous breaking of thick ice at .