J. Robert Oppenheimer, chief scientist of the Manhattan Project, tests with his team the first atomic bomb. The test is successful.

A U-boat crew hears the alarm sound and prepares for an emergency dive. After the crew is in position, the captain reveals that it was only a practice drill so they don't get rusty in the event of a real emergency. Such drills help the crew escape the U-boat in the event of a mechanical failure or an attack by an enemy.

The Japanese conduct a surprise aerial attack on Darwin harbor in Australia. Despite the Australian people's efforts to defend themselves, they suffer heavy losses, as Darwin is lightly defended.

Mead brings a radio to the Frank family and informs Anne of the events going on the world and what that means for the family.

JoJo reasons with the Jewish girl hiding in his house, as he reveals his his indoctrination with Nazi beliefs about Jews, that they're superior.