Sherlocks on the Sand

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Across
  1. 4. Close companion of Spongebob
  2. 5. Architectural beach masterpiece
  3. 6. Use this to "Hang 10!"
  4. 8. Tall-standing guide for ships
  5. 9. Water movements that leave a foamy trail
Down
  1. 1. Sun's worst enemy
  2. 2. Savior on sand and sea
  3. 3. Surfing's little sibling
  4. 6. Meeting point for land and water
  5. 7. Wooden walkway, often with shops