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John Leslie narrates this educational film detailing the giants of British road construction. The mighty machines are pushed to the limit at a demonstration session featuring diggers, dumpers, cranes and rollers From mining the oil sands of Alberta to boring under the English Channel, some of the most extreme machines made by man are devoted to digging. We take a look at six of the biggest monsters of earth moving. From mining the oil sands of Alberta to boring under the English Channel, some of the most extreme machines made by man are devoted to digging. Let's take look at six of the biggest monsters of earth moving. Many of the extreme machines on our list have spent time in mines, but only the Bucyrus RH400 has made a cameo in a Michael Bay film. The world's largest hydraulic shovel inspired the vehicle form of the Decepticon Demolishor in the 2009 movie Transformers 2: Revenge of the Fallen. When it's not appearing on the silver screen, the RH400 can be found in the Canadian oil sands in Alberta, where this three-story-high behemoth set a production record, excavating 9000 tons of earth in 1 hour. The RH400's shovel can hold up to 94 tons or 57 cubic yards in its shovel, which has what Bucyrus calls a clamshell design that opens at the bottom to empty its payload more quickly. Two 16-cylinder engines combined generate 4400 hp, running the RH400 and its 14 hydraulic pumps, which hold up to 3400 gallons of fluid—enough to fill a small backyard pool. With an $11 million price tag, it is best to leave as little downtime as possible when working the RH400 in a mine or oil sands. Bucyrus makes that continuous work easier on the driver by including a separate room behind the cab that can be outfitted with a refrigerator and a microwave. While the Bucyrus RH400 was the one to make its star turn in Transformers 2, the 31-million-pound Bagger 293 might have been the machine better suited for the role of villain in a sci-fi summer blockbuster. This bucket-wheel excavator, the Guinness World Record–holder for largest land vehicle, cuts an intimidating figure at a towering 310 feet tall and 722 feet long. Stationed in the Hambach strip mine in western Germany's Rhineland, Bagger 293 digs for lignite, a low-grade coal used in steam–electric power plants. The Bagger's 71-foot-diameter wheel spins its 18 1452-gallon buckets, scooping up earth that it dumps onto a conveyor belt built into its boom arm. Every day the Bagger moves up to 8.48 million cubic feet of material, enough to fill 96 Olympic-size swimming pools. When Caterpillar introduced the 797B in 2002, it entered its class as one of the largest dump trucks in the world; six years later, Caterpillar upped the ante with its 797F, besting its predecessor in both payload capacity and horsepower. The 797F sports a 20-cylinder 4000-hp single-block engine, which bests the 797B by 450 hp. Caterpillar's massive truck also hauls 20 tons more than its earlier incarnation, moving it into the rarefied air of trucks with a 400-ton payload.