Across
- 3. Postcode the big red boat departs from, letters only (6)
- 6. Southernmost sandwich (4)
- 7. Argentine submarine formerly known as USS Catfish (5,2)
- 9. 17/1/1775 (10,3)
- 11. Massive cloud breaker (9,5)
- 12. Forbidden leaf that crashes economies (7)
- 14. The highest compliment a plumber can provide (7)
- 16. Fe male peninsula (8)
- 20. Correct new name for St Andrews (13)
- 21. Pulse like dramatic cloud (10)
Down
- 1. Fluffy bundle of joy (3,8)
- 2. The Montreal protocol sought to address this Antarctic hole (5)
- 4. Regulator of fish (6)
- 5. Zavodovski volcano and experience (8)
- 8. Localised Köppen climate classification (6)
- 10. Local sea which is considered new in east Canada (6)
- 13. Island of Shackleton stranding and massive seal (8)
- 15. The former north sandwich islands (6)
- 17. Freezing lookout similar to a plane (9)
- 18. Ideal weather for winter sports (8)
- 19. Antarctica's largest sub-glacial lake (6)
- 22. Southernmost active volcano (6)