However, unknown to the travelers, there are two individuals not trying to catch a train, but rather trying to smuggle a 3D-printed firearm through security. They are two reporters from The Mail on Sunday, and in an effort to bring awareness to the dangers of 3D-printed firearms, they downloaded the Liberator blueprints online, bought a 3D-printer, printed the 16-part pistol, purchased a common nail you would find at a hardware store to act as the firing pin, and successfully smuggled the pistol parts onto a crowded Eurostar heading to Paris.