A 1200 foot-long bridge is on the verge of collapse above a fast flowing river, and the Liebherr 1200 heavy lift crane has to take it down. It just might be the toughest job the Boston wrecking crew has ever faced. The Tan’erliq is one of the most powerful tug boats on the planet and it has to tackle one of the toughest jobs – towing oil-filled supertankers out of trouble. But even though the tug boasts a 10,000 horsepower engine, it’s not just grunt that gets the job done, Tan’erliq’s incredible multi-directional propellers mean she can turn on a dime.