–from Shackleton’s account “South”–
“The ice did not trouble us again seriously until the end of September, though during the whole month the floes were seldom entirely without movement. The roar of pressure would come to us across the otherwise silent ice-fields, and bring with it a threat and a warning. Watching from the crow’s-nest, we could see sometimes the formation of pressure-ridges. The sunshine glittered on newly riven ice-surfaces as the masses of shattered floe rose and fell away from the line of pressure. The area of disturbance would advance towards us, recede, and advance again.
“The routine of work and play on the ‘Endurance’ proceeded steadily. Our plans and preparations for any contingency that might arise during the approaching summer had been made, but there seemed always plenty to do in and about our prisoned ship. Runs with the dogs and vigorous games of hockey and football on the snow-covered floe kept all hands in good fettle.”