Oi Oi Pirates!

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Across
  1. 1. Floating device used to mark locations in the water
  2. 4. Shiny valuable metal pirates seek
  3. 5. Sandy area by the sea
  4. 9. Pirates often search for this buried item
  5. 11. What is the bottom of the sea called
  6. 13. Large body of saltwater
  7. 14. A place to tie a boat
  8. 15. Structure built by kids on the beach
  9. 17. Part of a ship that catches wind
  10. 19. A pirate's drink made from sugar
  11. 20. Where you build sandcastles
Down
  1. 2. Ocean creature with eight arms
  2. 3. Underwater breathing equipment
  3. 6. Pirates might wear this over one eye
  4. 7. Round objects found on the beach, made by oysters
  5. 8. Hard outer shell found on the beach
  6. 10. What pirates say instead of "yes"
  7. 12. A large wave caused by an underwater earthquake
  8. 16. Pirates sail on this
  9. 17. Sharp object used by pirates
  10. 18. Sandy areas near the ocean