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Polish river monitor 'Krakow'
Prototype German submarine U-1406
British marine monitor Cyclops
French submarine cruiser "Surcouf"
Surcouf was the largest French submarine cruiser having served during the Second World War. The boat was lost during the night of 19 February 1942, in the Caribbean Sea, possibly after colliding with an American freighter. Surcouf was named after the French privateer Robert Surcouf. It was the largest submarine built until surpassed by the first Japanese
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Answers by country

Polish river monitor 'Krakow'
Prototype German submarine U-1406
British marine monitor Cyclops
French submarine cruiser "Surcouf"
answers
flagAustralia
7%
30%
11%
50%
26
flagthe Netherlands
25%
16%
9%
48%
31
flagCanada
10%
30%
10%
45%
20
flagGermany
18%
31%
12%
37%
261
flagIndia
18%
37%
6%
37%
16
flagGreece
31%
12%
18%
37%
16
flagthe United Kingdom
23%
31%
8%
36%
93
flagAustria
29%
26%
5%
35%
34
flagPoland
33%
23%
10%
32%
3329
flagthe United States
18%
37%
11%
31%
127
flagRepublic of Ireland
30%
23%
15%
30%
13
flagSwitzerland
18%
36%
18%
27%
11