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This is easy, they showed it on youtube. They first created a prosthetic chest over his real chest and spray tanned it to match his original skin tone. Then they put in his "heart" so it would look like it's actually a hole in his chest while his actual chest is underneath it.

This was done using a prosthetic chest on his real chest (make sure to sing that to the tune of "We Want A Rock" by They Might Be Giants). Skip to 2 minutes in for an explanation. ...