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Hitler's secret Nazi war machines of World War II

Alex LockieSep 1, 2016, 21:18 IST

Bundesarchiv

Today marks the 77th anniversary of the start of World War II -when Hitler's Nazi army invaded Poland.

Hitler's engineers secretly developed some of the most ambitious projects and rapidly produced sophisticated technology decades before its time.

In the 2015 fall issue of Weapons of WWII magazine, author KM Lee detailed some of Hitler's advanced weaponry.

Here's a look at are some of the secret, lethal weapons the Nazis created during World War II: