Did you plan on getting lost in the middle of the woods, where no one could hear your calls for help? Of course you didn't.
"I wanted to help others if they ever had a moment of getting lost," he says. "I was inspired when I saw a similar item by another person—but they missed out on the survival aspect."
By blowing into holes in a tin can lid, users can produce a piercing whistle. "I was actually surprised how much noise it could make," Specific Love Creations says. In addition to the video below, he posted the project on Instructables, and allowed Popular Science to share it here.