I-21 (伊号第二一潜水艦, I-gō Dai Nijū-ichi sensui-kan) was a Japanese Type B1 submarine which saw service during World War II in the Imperial Japanese Navy. She...

在ウズベキスタン日本国大使館. Embassy of Japan in Uzbekistan. "安倍内閣総理大臣による豪州ダーウィンにおける伊号第124潜水艦慰霊碑訪問 2-19-11-17" (in Japanese). Ministry of Foreign Affairs (Japan). Retrieved...