Max's crossword

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Across
  1. 3. fast
  2. 4. underground
  3. 8. fast movement
  4. 11. secret camo
  5. 12. to oversee
  6. 14. celebrity
  7. 15. ??
  8. 16. think different
Down
  1. 1. underwater vessel
  2. 2. so far
  3. 3. large group
  4. 5. place underground
  5. 6. guiding
  6. 7. baseball position
  7. 9. small market
  8. 10. to write a line under something
  9. 12. varies between temperature
  10. 13. outside point