Diving with Blue Whales

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Across
  1. 5. Move in water
  2. 11. Breathing tubes
  3. 12. Visual perception
  4. 13. Feeling extreme happiness
  5. 15. Measurement from end to end
  6. 16. With elegance
  7. 18. whale: Largest mammal
  8. 19. Ready
  9. 20. Plunge into water
Down
  1. 1. Shouts out
  2. 2. Enormous in size
  3. 3. Swim gear
  4. 4. Facial coverings
  5. 6. Enormous creature
  6. 7. Ship leader
  7. 8. Pay no attention to
  8. 9. Go after
  9. 10. Air pockets in liquid
  10. 14. Living being
  11. 17. Not easily forgotten