Sub and Super

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Across
  1. 2. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
  2. 4. situated or applied under the skin.
  3. 7. underwater boat
  4. 8. put underwater
  5. 9. below the threshold of conscious perception
  6. 11. in one's mind without knowing it
  7. 13. prepared to obey others unquestioningly.
  8. 14. on the surface not deep
Down
  1. 1. to make subservient; force to submit or subdue
  2. 3. below an average level.
  3. 5. excellent
  4. 6. lay something over something else
  5. 10. a taxonomic category that ranks below phylum and above class.
  6. 11. underground railroad
  7. 12. of considerable importance, size, or worth.