No rules, no rounds, no gloves. Europe is seeing a clandestine emergence of illegal underground "No Rules" fight clubs, all fought on concrete. Young men are risking life and limb at these events, which allow everything from biting and head-butting to eye-gouging and stamping. Away Days got special access into this world, attending hidden brawls all over Europe. It’s only a matter of time before someone dies—that’s why they love it.

• Documentary