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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
6%
30%
10%
53%
30
flagthe Netherlands
24%
15%
9%
51%
33
flagCanada
10%
30%
10%
45%
20
flagAustria
22%
18%
14%
41%
48
flagGermany
16%
30%
14%
38%
359
flagGreece
31%
12%
18%
37%
16
flagthe United Kingdom
24%
30%
8%
35%
98
flagIndia
17%
41%
5%
35%
17
flagPoland
33%
22%
10%
32%
3487
flagthe United States
17%
38%
11%
30%
134
flagRepublic of Ireland
33%
26%
13%
26%
15
flagSwitzerland
22%
54%
9%
13%
22
flagthe Philippines
50%
20%
20%
10%
10