FIVE YEARS in the making, RMS Mauretania and her sister the Lusitania represented a new era in British shipbuilding. Ostensibly built to compete against record-breaking German behemoths, the Mauretania was not only one of the first major ships to be turbine-driven or have four propellers - she was the largest moving structure ever to have been created by man at that time. And, soon enough, she would become the fastest as well.But the Mauretania wasn't...