If it is plausible to imagine a historical timeline where Hitler won, then why not one in which the tsars still rule Russia, the British Empire was never exhausted by war, and the Ottoman Empire still controls the Middle East?
So many years later, it is difficult to conceive of just how devastating the fall of Singapore was. It was the largest surrender in British history, a humiliation to British arms that would linger for years in the minds of friends and foes alike.