| 2025-12-17 | Enemy W.W. II vessel |
| 2025-10-07 | W.W. II menace |
| 2025-07-10 | German war vessel |
| 2025-06-25 | Concern for an Allied ship |
| 2024-10-26 | Menace in "Dead Wake: The Last Crossing of the Lusitania" |
| 2024-04-29 | German sub in W.W. II fighting |
| 2023-07-06 | W.W. II sub |
| 2022-02-02 | Threat to the Allies in W.W. II |
| 2021-09-26 | W.W. II threat |
| 2021-05-01 | In-depth subject for a war historian? |
| 2020-08-11 | Wolf pack vessel in W.W. II |
| 2020-02-24 | W.W. II German sub |
| 2020-01-17 | Something forbidden by the Treaty of Versailles after W.W. I |
| 2018-10-17 | Menace in the 1957 film "The Enemy Below" |
| 2018-02-28 | W.W. II menace |
| 2017-06-04 | W.W. II danger |
| 2016-12-11 | W.W. II danger |
| 2016-06-13 | W.W. II German vessel |
| 2016-04-10 | See 23-Across |
| 2015-12-29 | Destroyer destroyer |
| 2015-07-14 | Lusitania sinker |
| 2015-06-26 | Source of doom for the 17-Across |
| 2015-02-13 | Battle of the Atlantic craft |
| 2014-04-10 | See 7-Down |
| 2014-01-04 | Raider in the battle of the St. Lawrence |
| 2014-01-01 | W.W. II menace |
| 2011-09-10 | Wolf pack member |
| 2011-07-18 | W.W. II ship sinker |
| 2011-04-17 | Battle of the Atlantic vessel |
| 2010-06-17 | Concern for an Allied ship |
| 2010-04-29 | W.W. II blockade enforcer |
| 2010-03-28 | Maritime threat of the early 1940s |
| 2010-01-05 | W.W. II sea menace |
| 2009-08-24 | W.W. II German sub |
| 2009-07-22 | W.W. II menace |
| 2009-05-26 | Torpedo launcher |
| 2009-03-20 | German diver |
| 2009-02-23 | W.W. II Atlantic lurker |
| 2008-10-09 | Destroyer hunter |
| 2008-09-25 | W.W. II blockade enforcer |
| 2008-09-14 | Sub with sauerkraut? |
| 2008-08-01 | Ship sinker |
| 2008-01-26 | Liner threat, once |
| 2007-09-18 | Kriegsmarine vessel |
| 2007-04-24 | Naval convoy menace |
| 2006-01-08 | W.W. II menace |
| 2005-05-15 | Q-ship's quarry |
| 2005-03-23 | Wolf pack member |
| 2004-12-26 | Lusitania sinker |
| 2004-09-09 | One in search of a tin can |
| 2004-03-29 | W.W. II vessel |
| 2004-03-26 | W.W. II predator |
| 2003-09-09 | The Lusitania's undoer |
| 2003-04-16 | W.W. II danger |
| 2002-05-19 | German sub |
| 2002-05-10 | Wolf pack member |
| 2002-03-02 | German diver |
| 2002-01-14 | W.W. II sub |
| 2001-11-04 | Tin can's target |
| 2001-09-23 | It may give a sinking feeling |
| 2001-01-30 | Member of a W.W. II wolf pack |
| 2000-12-04 | Wartime sea menace |
| 2000-10-22 | Sub |
| 2000-05-15 | Depth charge target |
| 2000-05-07 | Sinker |
| 2000-04-10 | Shipper's worry in W.W. I |
| 2000-03-27 | German sub |
| 1999-11-01 | Sub that sank Allied ships |
| 1999-09-22 | W.W. II menace |
| 1999-08-01 | One trying to avoid charges? |
| 1999-05-31 | German sub |
| 1999-05-27 | German threat |
| 1999-05-10 | German sub |
| 1999-04-28 | German sub |
| 1999-04-23 | "Das Boot" setting |
| 1999-04-16 | Depth charge target |
| 1997-10-28 | W.W. II menace |
| 1997-08-27 | Part of a wolf pack |
| 1997-08-10 | Sub |
| 1997-08-05 | German sub |
| 1997-05-13 | German sub |
| 1997-02-24 | German sub |
| 1997-02-18 | W.W. II predator |
| 1997-01-26 | W.W. II menace |
| 1996-12-11 | Tin can's target |
| 1996-11-26 | German sub |
| 1996-10-04 | Wolf pack member |
| 1996-04-19 | Wolf pack member of W.W. II |
| 1995-06-18 | Sinker of sorts |
| 1995-03-17 | W.W. II craft |
| 1994-11-08 | Ship sinker |
| 1994-06-01 | Convoy chaser |
| 1994-01-12 | Lusitania sinker |