Shackleton's Way

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Across
  1. 2. A large body of water
  2. 4. The name of Shackleton's ship
  3. 6. A long journey by sea
  4. 8. The largest desert in the world
Down
  1. 1. Someone who commands a group
  2. 3. Opposite of hot
  3. 5. Shackleton's first name
  4. 7. Where Shackleton returned to civilization "Whaling _____"