Sailing into Steam

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Across
  1. 5. The largest freshwater reptiles in Georgia Aquarium(9)
  2. 8. The A in STEAM (3)
  3. 9. The galaxy that we live in (5,3)
  4. 11. The name of the ROV used to explore under water wrecks (8)
  5. 13. The T in STEAM (10)
Down
  1. 1. Light Amplification by Stimulated Emission of Radiation (5)
  2. 2. An underwater ecosystem created by a piece of history(9)
  3. 3. A machine used to launch heavy objects (8)
  4. 4. The reason a boat floats (8)
  5. 6. The name of a black flag with a skull and cross bones (5,5)
  6. 7. The M in STEAM (4)
  7. 10. The S in STEAM (7)
  8. 12. The E in STEAM (11)