by Owen James Burke
The Romans managed to keep an incredible scientific secret until now. Image via Ancient Origins
In July of 1535, an Italian inventor by the name of Guglielmo de Lorena and his partner Francesco de Marchi began surveying a pair of sunken barges on a lake which once belonged to 1st century A.D. Roman emperor Caligula. The two men did not let on how they were accomplishing their feat, and until now, no one had proposed any clear hypothesis as to how the they managed to descend to the bottom of the 108-foot deep lake and remain there long enough to gather the information and artifacts with which they returned.