In today’s History newsletter: What is hidden in Hitler’s secret war lair? Plus, learn about four lost cities of Africa, and see the face of an ancient Egyptian recreated from 4,500-year-old DNA.

But first: The real story behind the deadliest shark attack in history.

PHOTOGRAPH BY NAVAL HISTORY AND HERITAGE COMMAND

The sinking of the U.S.S Indianapolis is considered one of the worst tragedies ever for the U.S. Navy. While widely known as the worst shark attack in history, the truth is even more horrifying.

More stories:
— She survived the Titanic—and two other disasters at sea
— 'World’s worst shipwreck' was bloodier than we thought

PHOTOGRAPH BY OLEKSANDRA KOROBOVA; GETTY IMAGES

VIDEO BY HALLEY BROWN

In 1932, Australia went to war against 20,000 emus ... and lost. Learn more about this surreal military campaign in the latest installation of “How in the history,” a social video series for the eternally curious that explores unexpected moments from our past. Watch it here on Instagram.

BEFORE YOU GO: A group of adventurers set out to find a mythical oasis. Instead, they found a Stone Age surprise.

Thanks for reading today’s newsletter, edited and curated by Jennifer Baik and produced by Alisher Egamov. Catch our latest Photo of the Week every Sunday—and sign up here to get our future adventures in your inbox.