Metallica's show down under -- WAY down under -- has worked its way into the Guinness World Records 2015 book. By virtue of its December 8, 2013 show at Argentina's Carlini Station in Antarctica in front of 120 scientists, competition winners and "300 very curious penguins" according to frontman James Hetfield, the quartet has been named the first and only band to perform on all seven of the Earth's continents, an achievement that's being commemorated in the latest Guinness edition. In a statement, Metallica said that, "Last year as we hit the road, like we do most years, visiting a lot of our favorite places along with some new ones, we didn't realize that we were on track to break a world record! Good thing someone else was paying attention as we managed to play on all seven continents in one year, becoming the first and only band to ever do so! Our friends at 'Guinness World Records' took notice bestowing on us the distinct honor of being featured in their official book hitting stores September 10th....We were literally at the bottom of the earth for one of the most unique, special and unforgettable days in our 30+ years as a band and low and behold, our little adventure sealed the deal for the record! Who woulda thought." Metallica is now presumably hard at work recording its next album, the long-promised follow-up to 2008's "Death Magnetic," though no time frame for a release has been announced.