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%
11
flagRepublic of Ireland
5%
0%
94%
0%
37
flagFrance
0%
5%
94%
0%
17
flagCanada
6%
0%
90%
0%
33
flagthe United Kingdom
6%
1%
88%
1%
161
flagAustralia
9%
0%
85%
1%
61
flagGreece
0%
0%
84%
15%
13
flagthe Netherlands
9%
9%
81%
0%
11
flagPoland
7%
3%
80%
6%
2974
flagGermany
0%
6%
80%
12%
50
flagItaly
7%
7%
76%
7%
13
flagthe United States
13%
6%
75%
1%
203
flagIndia
27%
2%
58%
4%
43
flagthe Philippines
21%
0%
50%
0%
14