Russell Crowe

And once – because I didn't know he was a mountain climber – once I knew that –

Then I started looking around for what does that mean to be a mountain climber prior to the First World War?

What kind of equipment would you have?

And it's very basic, man.

It's nothing.

You're relying on your wits and your strength just completely.

It's going to behave completely differently once it gets wet.

But it gave me some real insight to him.

And it also ended up giving me this great way of connecting to the other German guys who are playing the other Nazis.

Because I just knew from the first day when they all arrived and I was sitting together in a group

I could see that they were already feeling the punishment of playing that kind of character.

So I just brought them together and I asked them, because these guys, some of them are German, some of them are Hungarian.

And I said, look, you know, there's this song that I found, and I'd like to learn the song together.

And they all, you know, most of them knew the song.

But that's what we would do every day as a group.

We'd get together, we'd sing that song, and then we'd walk into court together, feeling connected as a unit, you know.

It's called Mussi Den.

It's a German song.

And what I didn't realize when I first came across it, it's a Bavarian mountain song.

So he definitely knew that song.