Huge sunken ship pulled from the bottom of the ocean loaded with over 1,400 cars still intact

When two ships collided in early December 2012, a cargo ship hauling along 1,400 cars sunk its way down to the bottom of a busy shipping channel. Because of the danger for other travelers in the channel and the probable environmental damage that would be done, someone had to go down there and fish out the vast majority of the wreckage.
Bringing it up would take careful planning and heavy machinery but it was vital to ensuring the safe future use of the shipping lane.