Puzzle Time!

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Across
  1. 1. to find out for certain
  2. 5. an inflow of water
  3. 6. an outpouring
  4. 8. the unit of speed used especially in ships and aircrafts
Down
  1. 2. about to happen
  2. 3. the main body of the ship
  3. 4. a small hole made by piercing
  4. 7. a circular movement of water causing small whirlpool