A robot submarine found the 'Holy Grail of shipwrecks'
by from on (#3QXN0)
Spanish treasure fleets that traversed the Atlantic Ocean to the Americas and back were a 16th century invention as important as free two-day shipping. Organized 70 years after Columbus' first voyage, the fleet was made up of several specialized ships with one primary goal: Exploiting the riches of the New World as efficiently as possible.