| Born | 15 Aug, 1905 | Posen |
| Died | 2 May, 1993 |
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Ranks
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Personal information
![]() Korvkpt. Karl-Friedrich Merten |
After a ten-year stint on warships and serving on the WWI battleship Schleswig-Holstein during the attack on the Polish "Westerplatte" in September 1939, Merten joined the U-boat arm on 1 May, 1940. He operated all over the world, patrolling in the Atlantic, the Caribbean and the Indian Oceans. U-68 was in the U-boat wolfpack "Eisbär" (Polar bear), which in the course of a few weeks during September/October 1942 sank more than 100,000 tons of shipping off South Africa.
In January 1943 Merten became the commander of the 26th U-boat-Flotilla in Pillau. There the new U-boat crews received their final training before going to the front. In March 1943 Merten moved to the 24th U-boat-Flotilla in Memel where he also was the flotilla commander. This was the training flotilla for future Commanders-to-be.
After the war Merten salvaged sunken ships in the Rhine river along with another famous former U-boat commander, Heinrich Lehmann-Willenbrock. Later he worked in the shipbuilding industry.

Karl-Friedrich Merten during the funeral of Großadmiral Dönitz in 1981,
behind him Oblt. Otto Westphalen (U-968)
Patrol info
| U-boat | Departure | Arrival | |||||
| 1. | U-68 | 30 Jun, 1941 | Kiel | 1 Aug, 1941 | Lorient | Patrol | 33 days |
| 2. | U-68 | 11 Sep, 1941 | Lorient | 25 Dec, 1941 | Lorient | Patrol | 106 days |
| 3. | U-68 | 11 Feb, 1942 | Lorient | 13 Apr, 1942 | Lorient | Patrol | 62 days |
| 4. | U-68 | 14 May, 1942 | Lorient | 10 Jul, 1942 | Lorient | Patrol | 58 days |
| 5. | U-68 | 20 Aug, 1942 | Lorient | 6 Dec, 1942 | Lorient | Patrol | 109 days |
Ships hit by Karl-Friedrich Merten
| Date | Boat | Name of ship | Tons | Nat. | Convoy | Fate * | |
| 22 Sep, 1941 | U-68 | Silverbelle | 5.302 | | br | SL-87 | |
| 22 Oct, 1941 | U-68 | Darkdale | 8.145 | | br | ||
| 28 Oct, 1941 | U-68 | Hazelside | 5.297 | | br | ||
| 1 Nov, 1941 | U-68 | Bradford City | 4.953 | | br | ||
| 3 Mar, 1942 | U-68 | Helenus | 7.366 | | br | ||
| 8 Mar, 1942 | U-68 | Baluchistan | 6.992 | | br | ||
| 16 Mar, 1942 | U-68 | Baron Newlands | 3.386 | | br | ||
| 17 Mar, 1942 | U-68 | Allende | 5.081 | | br | ||
| 17 Mar, 1942 | U-68 | Ile de Batz | 5.755 | | br | ||
| 17 Mar, 1942 | U-68 | Scottish Prince | 4.917 | | br | ||
| 30 Mar, 1942 | U-68 | Muncaster Castle | 5.853 | | br | ||
| 5 Jun, 1942 | U-68 | L.J. Drake | 6.693 | | am | ||
| 6 Jun, 1942 | U-68 | C.O. Stillman | 13.006 | | pa | ||
| 10 Jun, 1942 | U-68 | Ardenvohr | 5.025 | | br | ||
| 10 Jun, 1942 | U-68 | Port Montreal | 5.882 | | br | ||
| 10 Jun, 1942 | U-68 | Surrey | 8.581 | | br | ||
| 15 Jun, 1942 | U-68 | Frimaire | 9.242 | | fr | ||
| 23 Jun, 1942 | U-68 | Arriaga | 2.345 | | pa | ||
| 12 Sep, 1942 | U-68 | Trevilley | 5.296 | | br | OS-38 | |
| 15 Sep, 1942 | U-68 | Breedijk | 6.861 | | nl | ||
| 8 Oct, 1942 | U-68 | Gaasterkerk | 8.679 | | nl | ||
| 8 Oct, 1942 | U-68 | Koumoundouros | 3.598 | | gr | ||
| 8 Oct, 1942 | U-68 | Sarthe | 5.271 | | br | ||
| 8 Oct, 1942 | U-68 | Swiftsure | 8.207 | | am | ||
| 9 Oct, 1942 | U-68 | Belgian Fighter | 5.403 | | be | ||
| 9 Oct, 1942 | U-68 | Examelia | 4.981 | | am | ||
| 6 Nov, 1942 | U-68 | City of Cairo | 8.034 | | br | ||
| 170.151 | |||||||
* Unless otherwise noted the ships listed here were sunk. | |||||||
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