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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Answers by country

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
answers
flagNew Zealand
3%
3%
77%
14%
27
flagSpain
11%
5%
70%
11%
17
flagRepublic of Ireland
4%
13%
69%
13%
46
flagCanada
10%
10%
55%
22%
67
flagthe United Kingdom
9%
13%
53%
21%
366
flagGermany
6%
16%
53%
18%
91
flagthe United States
10%
18%
52%
17%
965
flagAustralia
11%
18%
49%
17%
93
flagGreece
14%
23%
47%
14%
21
flagPoland
12%
20%
46%
20%
21803
flagJapan
0%
40%
44%
8%
25
flagSweden
16%
28%
44%
12%
25
flagNorway
17%
17%
41%
23%
17
flagIsrael
7%
46%
38%
7%
13
flagthe Philippines
27%
21%
35%
16%
37
flagFrance
14%
7%
35%
42%
14
flagthe Netherlands
6%
24%
33%
33%
33
flagIndia
28%
32%
28%
10%
88
flagMalaysia
13%
46%
26%
13%
15
flagPakistan
33%
33%
13%
20%
15