Three large and specially-modified Hitachi Zaxis ZX870-3 excavators will help clear one of the world's biggest ship graveyards as part of a 22-month project. The excavators will be used by Mammoet Salvage to break 70 of around 300 rotting ships into smaller, more manageable pieces. The decaying wrecks, weighing from 200-1,200tonnes, have been abandoned in Nouadhibou Bay, Mauretania, over the past 20 years, and have caused the shipping industry to decline in recent years as they pose a hazard to the environm