Across
- 3. Known collaguially as 'wrens', they did an under-recognised job
- 7. German attack submarines
- 10. Explosive device left floating in the water
- 11. German navy
- 12. Method of detection of submarines
- 14. Explosive device thrown overboard to destroy submarines
- 15. A protected formation for freight shipping
- 17. Convoy escort ships named after flowers
- 18. Undersea weapon launched from a submarine
Down
- 1. Iconic German 'pocket' battleship
- 2. German cryptoanalysis department
- 4. WRNS operation to simulate U-boat attacks
- 5. Naval barrier preventing flow of goods
- 6. Anti-submarine projector
- 8. Group of German attack submarines
- 9. Non-naval vessels used for freight
- 13. Modification which allowed U-boats to take in air while submerged
- 16. German admiral commanding the German U-boat fleet