U22 Periscope

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Across
  1. 3. To move from one place to another.
  2. 5. Empty inside.
  3. 8. To lower your body using only your waist.
  4. 9. Curved glass that makes things look clearer when we see through it.
  5. 10. A beam of energy from the sun, a candle, or a lamp.
  6. 12. A type of ship that can travel underwater.
  7. 13. To look quickly and secretly.
Down
  1. 1. A long tube with mirrors fitted inside.
  2. 2. To hit a surface and quickly change directions.
  3. 4. A bus with two levels.
  4. 5. Difficult to see or find.
  5. 6. To make something look bigger.
  6. 7. To watch carefully.
  7. 11. A long, hollow object.