"Pack ice is composed of massed fragments of sea ice drifting with wind and current. Modern Icebreakers such as Glacier, Edisto and Eastwind normally transit such ice fields without difficulty or loss of speed. However, thinned skinned vessels must be protected from ice pressures against their hulls. This may be accomplished by leading the escorted vessel through the dangerous areas with its bow lashed firmly into the notched stern of the icebreaker. Here Eastwind is represented towing YOG-34 through the Ross Sea pack, while overhead one of the helicopters scouts the ice conditions." --Commander Standish Backus