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How successful were the human torpedoes, developed by the Japanese during the WW2?

it was a great success and the main threat for US Navy

it was a success, over 50 ships were sunk

it was a disappointment

it was never used

Kaitens had a very limited diving depth, which in turn limited the diving depth of the host submarine. This is one of several factors blamed for the very poor survival rate of submarines armed with kaitens: eight submarines being lost for the sinking of only two enemy ships and damaging several others.

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New Zealand

3%

3%

77%

14%

27

Spain

11%

5%

70%

11%

17

Republic of Ireland

4%

16%

67%

12%

49

Germany

6%

14%

57%

16%

102

Canada

11%

10%

54%

22%

68

the United Kingdom

9%

13%

53%

21%

372

the United States

10%

18%

52%

17%

976

Greece

13%

21%

52%

13%

23

Australia

11%

18%

49%

17%

93

Poland

12%

20%

46%

20%

21877

Japan

0%

40%

44%

8%

25

Sweden

16%

28%

44%

12%

25

Norway

17%

17%

41%

23%

17

Israel

7%

46%

38%

7%

13

the Philippines

27%

21%

35%

16%

37

France

14%

7%

35%

42%

14

the Netherlands

5%

23%

32%

35%

34

India

28%

32%

28%

10%

88

Malaysia

13%

46%

26%

13%

15

Pakistan

33%

33%

13%

20%

15

The first rocket planes ever to be mass-produced were the Messerschmitt Me 163 in 1944. Which other country used rocket planes during WW2?

The term "kamikaze" usually refers to the plane strikes. What devices were also used by the Japanese for intentional suicide attacks during WW2?

What is the main reason to use nuclear reactor on a submarine?

it needs no oxygen

it needs no frequent refuelling

Which country mass-produced speedboats packed with explosives as a weapon during WW2?