Allied intelligence personnel had deciphered much of the Japanese Mo plans through radio intercepts at the Allied Fleet Radio Units (radio intelligence centers) in Melbourne, Australia and Pearl Harbor, Hawaii.
Personel intelijen militer Sekutu telah memecahkan banyak sandi Jepang tentang rencana Operasi Mo melalui penyadapan radio oleh Unit Radio Armada Sekutu (pusat radio intelijen) di Melbourne, Australia, dan Pearl Harbor, Hawaii.