Submarines

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Across
  1. 3. First Nuclear-powered submarine
  2. 6. Modern class of attack submarines
  3. 7. Type of propulsion
  4. 10. Command to submerge
  5. 12. Duty roster/rotation
  6. 13. Nickname for a nuclear propulsion technician
  7. 14. Submarine-launched ballistic missile
  8. 15. WWII German Submarines
  9. 17. Measure of neutron intensity
  10. 18. Shape designed to reduce drag underwater
  11. 19. _____ class - US Navy nuclear-powered fast attack sub
  12. 22. Weapon
  13. 24. Strategy document for descending safely
Down
  1. 1. Administrative rate
  2. 2. Power source for non-nuclear subs
  3. 4. Device for observing above water surface
  4. 5. Tanks used to control bouyancy
  5. 8. Group of personnel operating the sub
  6. 9. Command Center of the sub
  7. 10. Submarine escape chamber
  8. 11. Russian sub that sank in 2000
  9. 16. Outer body of a sub
  10. 20. Emergency exit
  11. 21. Sound navigation and ranging system
  12. 23. Vital for avoiding detection