I'm curious to hear about how people have "designed" their own underwater noise makers. Tell us about contraptions that you use to signal other divers underwater. I once saw this guy with a whole string of carabiners that he rattled underwater. Sounded like Santa Claus was coming to town but was a bit bulky to carry around and dragged along the floor. I'm also thinking about getting a subduck, but my sea-quest airsource is pretty difficult to keep in my mouth as it is without adding more equipment to the inflator hose, making the whole thing a lot stiffer. Never really cared for tank bangers that are a pain to change from tank to tank. I've always dreamed about some cool and easy to carry and use device but one head can only come up with so many ideas!