How do I make my voice sound like its coming from another part of my body?

For a university project I am trying to build an installation that makes it seem like I’m talking out of a part of my body (ie arm) that doesn’t make sound. The goal is to make it seem like I’m ‘talking’ out of that body part. What is the best way to transport the sound from my mouth (tubes, refectors?) and what kind of materials should I use? Any ideas would be helpful. Thanks.