Which country attacked Sydney Harbour with miniature submarines during World War II?

Germany
Italy
Japan
Indonesia
On the night of 31 May – 1 June, three Japanese Ko-hyoteki-class midget submarines, each with a two-member crew, entered Sydney Harbour, and attempted to sink Allied warships, ultimately killing 21 sailors.
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Answers by country

Germany
Italy
Japan
Indonesia
answers
flagIsrael
0%
0%
100%
0%
12
flagSpain
0%
0%
100%
0%
11
flagRepublic of Ireland
4%
0%
95%
0%
41
flagFrance
5%
5%
88%
0%
18
flagthe United Kingdom
6%
2%
87%
2%
188
flagGreece
0%
0%
87%
12%
16
flagCanada
8%
2%
86%
0%
37
flagNew Zealand
8%
8%
83%
0%
12
flagAustralia
9%
0%
82%
2%
75
flagGermany
1%
5%
81%
8%
80
flagPoland
7%
3%
80%
6%
3415
flagthe United States
12%
6%
76%
1%
247
flagthe Netherlands
15%
7%
76%
0%
13
flagItaly
12%
6%
75%
6%
16
flagRussia
16%
0%
66%
0%
12
flagMalaysia
20%
20%
60%
0%
10
flagIndia
32%
3%
53%
3%
52
flagthe Philippines
25%
0%
50%
0%
16