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
5%
5%
73%
15%
19
flagRepublic of Ireland
5%
10%
68%
15%
38
flagIndonesia
16%
25%
58%
0%
12
flagCanada
13%
11%
55%
17%
45
flagthe United Kingdom
9%
12%
54%
21%
291
flagSpain
18%
9%
54%
18%
11
flagAustralia
10%
16%
53%
16%
79
flagthe United States
10%
19%
52%
16%
864
flagGermany
6%
19%
52%
16%
61
flagGreece
11%
17%
52%
17%
17
flagJapan
0%
43%
50%
6%
16
flagPoland
12%
20%
45%
20%
20524
flagSweden
15%
31%
42%
10%
19
flagIsrael
8%
50%
41%
0%
12
flagthe Netherlands
4%
16%
40%
40%
25
flagthe Philippines
29%
12%
38%
19%
31
flagSingapore
9%
36%
36%
18%
11
flagIndia
22%
33%
33%
10%
66
flagMalaysia
7%
50%
28%
14%
14
flagFrance
18%
9%
27%
45%
11