A secure Singapore is the proposed replacement for Perth as an Anglo-American forward submarine base, with Dutch boats probably moving there as well. Submarine operations would give the Allies a further reason to reinforce the city. British and Indian troops could contribute, and an American Army formation is also considered possible. Keeping Singapore and the surrounding area under Allied control would make a Japanese move against Sumatra much more difficult. These gains depend on the base remaining secure and supplied.
Notable Point · 53:12-56:04
Singapore as a submarine base against Japan's resource lifeline
A surviving Singapore could replace Perth as the proposed Allied submarine base and make operations against Sumatra harder.