A team of archaeologists found an ancient Roman gladiator school in Austria using remote-sensing techniques over the last several years. The buried remains cover over 2,800 square meters and includes cell blocks, a training arena and a bath complex.
The outline of the school was found using aerial photography, ground-penetrating radar and magnetometer surveys. One technique the team used was attaching an electromagnetic induction sensor to the front of a four-wheeler ATV to transmit an EM field to create currents in the ground. Analyzing the soil’s electrical conductivity and magnetic susceptibility, the team was able to find out if the ground had ever been heated, uncovering hidden bricks.