The only known recording of Hitler's normal speaking voice

It has almost been 80 years since Adolf Hitler took his own life to escape Soviet troops from holding him accountable for his crimes against humanity in Berlin on 30 April, 1945.

With so many historical recordings of his speeches, you might think you'd know his voice if you ever heard it again.

But you probably don't.

That's because his normal speaking voice was a whole lot different when he was trying to rally his many Nazi supporters. And throughout history, there is only one known recording of Hitler's voice. Have a listen:

The German dictator is still considered by many to be the most evil man who ever lived after causing the mass extermination of six million Jews in Europe among his strange views of race, wealth and social norms.

However, footage of his public speeches at his 5,000 plus rallies within the time he ruled in the run up to World War II are enough to make anyone feel terrified.

That's because he sounded menacing.

With wild gesticulation and sharp, angry-sounding trigger words that he spat out into his crowd of supporters to rally them into a frenzy, he knew how to get the result he wanted: Mass hysteria and and an 'us against them' mentality.

Nazi leader Adolf Hitler is considered one of the most evil human beings in human history. (ullstein bild via Getty Images)

At first, it started with new policies, ways for women and men to act, and their pride in being German until he created his 'Final Solution'.

While the famous and terrifying footage of him speaking at the Nuremberg rallies are what many people bring to mind when thinking about Hitler's voice, there is scarce evidence of how he sounded in normal conversation.

In fact, the only evidence of how Hitler spoke normally was caught by a Finnish engineer in 1942.

The chat caught was between Hitler and Finland's defence leader Carl Gustaf Emil Mannerheim, and 11 minutes of it were recorded by the engineer before he was caught by the SS.

Hilter took his own life when Germany lost the war in 1945. (Keystone/Getty Images)

What's striking about the conversation is how normal Hitler sounds, at complete odds with the fierce and rage-filled speaker he was known as in public.

It's clear that his delivery as an orator was deeply affected, with Hitler speaking in a manner designed to make him out as a fearful and dominant leader.

In comparison, this clip sees him in far more conversational manner.

The tragedies of World War II are now around eight decades old, but there remain a few survivors; many of which have given harrowing accounts and testimonies of the brutality they experienced and witnessed during these dark days.

Hitler took his own life when Germany lost the war in 1945 and was being hunted by Soviet troops.