Survival - Going to extremes

123456789101112131415
Across
  1. 4. winner of competition
  2. 5. well known
  3. 7. opposite of shallow
  4. 9. very unusual
  5. 10. being afraid of something
  6. 13. submerge under water
  7. 14. quality of being strong
Down
  1. 1. go up
  2. 2. we have two ... in the chest
  3. 3. limit
  4. 6. something you achieved
  5. 8. concerning human mind
  6. 11. physical suffering
  7. 12. gaseous element essential to life
  8. 15. opposite of bottom