Sound designers Erik Aadahl and Ethan Van der Ryn, who both worked on Transformers, have also recently redesigned the classic Godzilla roar to meet 21st century standards for the film remake that comes out in theaters today, according to Wired.com.

Aadahl and Van der Ryn broke the roar down into parts, complete with their own personal sound effects:

“The main element is this metallic shriek accompanied by an earth-shattering sound,” Aadahl told Wired.com. “But there is kind of a bellowing finish. There’s the RRAAAAAAAAH of the attack and then an OWWWOOO-WOOMPH.”

The process involved many experiments. To create the metallic shriek, they placed dry ice on a metal vent that would vibrate piercingly as the ice reacted.  For the bellow, they first tried whales, but then switched to a wooden crate pulled across a polished floor.

Aadahl and Van der Ryn then recorded the roar on a Warner Bros. lot in New York, and projected it over a 12' x 18', 100 kilowatt speaker array, earning curious phone calls from Universal Studies two miles away.

For the full story, visit Wired.com, and check out this movie clip of Godzilla's roar: