| WWII maritime menace | 20 |
| WWII maritime marauder | 22 |
| WWII enemy sub | 14 |
| WWI danger | 10 |
| WW II sub | 9 |
| WW II shipping threat | 21 |
| World War II vessel | 19 |
| Wolf pack member of WWII | 24 |
| Wolf pack craft | 15 |
| Wartime sea menace | 18 |
| W.W. II sub | 11 |
| W.W. II ship sinker | 19 |
| W.W. II sea menace | 18 |
| W.W. II German sub | 18 |
| W.W. II danger | 14 |
| W.W. II Atlantic lurker | 23 |
| Vessel under Tirpitz's command: 1915 | 40 |
| Vessel in "The Enemy Below" | 37 |
| Unterwasser vessel | 18 |
| Underwater vessel | 17 |
| Tirpitz's menace: 1915 | 26 |
| Threat to a WWII destroyer | 26 |
| The Lusitania's undoer | 26 |
| Subsurface war vessel | 21 |
| Submarine of W.W. I | 19 |
| Sub with sauerkraut? | 20 |
| Sub that sank Allied ships | 26 |
| Sub of a sort | 13 |
| Sinker of sorts | 15 |
| Shipper's worry in W.W. I | 29 |
| Sea prowler | 11 |
| Sea marauder | 12 |
| Raider in the battle of the St. Lawrence | 40 |
| R.N. nemesis in W.W. II | 23 |
| Q-ship's quarry | 19 |
| Periscope's source | 22 |
| Part of Germany's World War fleet | 37 |
| One of Tirpitz's vessels | 28 |
| One of Tirpitz's menaces | 28 |
| One of a wolf pack | 18 |
| One in search of a tin can | 26 |
| Ocean raider | 12 |
| Ocean menace, once | 18 |
| Naval convoy menace | 19 |
| Member of the Kaiser's fleet | 32 |
| Member of a W.W. II wolf pack | 29 |
| Member of a W.W. I "wolf pack" | 40 |
| Maritime threat of the early 1940s | 34 |
| Marine menace of WW2 | 20 |
| Lusitania's sinker | 22 |
| Lusitania's attacker | 24 |
| Liner threat, once | 18 |
| Its first letter stands for "untersee" | 48 |
| It may give a sinking feeling | 29 |
| German WWII threat | 18 |
| German WWII sub | 15 |
| German threat | 13 |
| German sub of W.W. II | 21 |
| German sub of W.W. I | 20 |
| German sea denizen | 18 |
| German naval weapon | 19 |
| German lurker | 13 |
| Former Atlantic ocean threat | 28 |
| Erstwhile marine menace | 23 |
| Erstwhile German marine menace | 30 |
| Doenitz's concern | 21 |
| Destructive craft | 17 |
| Destroyer's foe | 19 |
| Destroyer's destroyer | 25 |
| Destroyer hunter | 16 |
| Depth-charge target of WWII | 27 |
| Depth charge target of WWII | 27 |
| Corvette's prey | 19 |
| Concern for an Allied ship | 26 |
| Certain torpedo launcher | 24 |
| Battle of the Atlantic participant | 34 |
| Axis vessel | 11 |
| Axis submarine | 14 |
| Axis predator | 13 |
| Atlantic convoy's foe | 25 |
| Athenia sinker | 14 |
| "The Enemy Below" attacker | 36 |
| "Das Boot" sub | 24 |
| "Das Boot," e.g. | 26 |
| ''Das Boot,'' for one | 37 |
| Bad news for twin middies at Annapolis? | 39 |
| German subs | 11 |
| WWII subs | 9 |
| Submerged threats of WWII | 25 |
| Wolf pack makeup | 16 |
| World War II vessels | 20 |
| W.W. II wolf pack | 17 |
| W.W. II threats | 15 |
| Some WWII crafts | 16 |
| Corvettes' targets | 22 |
| WWII ship sinkers | 17 |
| WWII maritime hazard | 20 |
| WWII depth charge targets | 25 |
| WWII "wolf pack" | 26 |
| World War marine menaces | 24 |