Mariana Trench

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Across
  1. 3. the top or highest point
  2. 5. able to go or work underwater
  3. 8. able to be controlled from a distance
  4. 9. old; from a time before history was recorded
Down
  1. 1. a quick look
  2. 2. needed; very important
  3. 4. able to control itself
  4. 6. a long, narrow groove or ditch
  5. 7. to grow well and be healthy