Ryan´s crossword puzzle

123456
Across
  1. 4. under water mountain
  2. 5. gets a little bit darker and more pressure
  3. 6. gets darker than the twilight zone and comes after the twilight zone
Down
  1. 1. deepest trench discovered
  2. 2. comes after the midnight zone gets a lot darker also known as the bottom of the ocean
  3. 3. went to challenge deep