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Guillermo del Toro Takes You Inside the Giant Robot Helmets in ‘Pacific Rim’ (Video)

The monsters are in big, big trouble — if del Toro doesn't kill off his actors first

Guillermo del Toro's "Pacific Rim" is not just a green screen and post-production action flick (we're looking at you, "Transformers") — though there is most definitely some of that. Filming was a far more analog, physical process than one might expect given the scale of the potential summer blockbuster.

The resulting fight scenes look incredible.

"The action in the movie is what you would have dreamt to see when you were 11," says director/writer/producer Guillermo del Toro in a new behind-the-scenes trailer.

See video: New 'Pacific Rim' Trailer Gives Humanity Two Options: 'Go Big or Go Extinct'

Del Toro built entire four-story "robot helmet" sets/"cockpits" that would vibrate, shake and drop 15 feet to make the action look and feel real. With the hydraulic resistance and heavy water sprays, del Toro says he invented a "torture machine" for his heroes.

"The actors were in for a ride," he says. "It was like a little amusement park simulator."

The Warner Bros. and Legendary Pictures movie, starring Charlie Hunnam and Idris Elba, smashes into theaters in Real 3D and IMAX 3D July 12.

Watch below.