Difficulty
B1 30-C2 90
A1
A2
A2+
B1
B1+
B2
B2+
C1
C1+
C2
0
10
20
30
40
50
60
70
80
90
100
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Caption: Endurance under sail, Antarctic Ocean, 1915 Paget colour photograph by Frank Hurley
Image credit
Shackleton's Endurance: How a Failed Expedition Became a Survival Legend
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