Archaeologists have also found a collective grave at the barracks, where they have so far discovered 13 adult skeletons along with a bronze coin and a bronze bracelet (AP Photo/Alessandra Tarantino)

The remains of the ancient barracks were discovered at the planned Amba Aradam metro stop on Rome's Metro Line C, which has been under construction since 2007

Work on Rome's Metro Line C, where the remarkable find occurred, has been beset by delays due to corruption probes and funding shortages since launching in 2007.

And, the recent discovery isn't the only instance in which construction on the city's public transit ran into this kind of obstacle.

In 2014, archaeologists found the remainders of an ancient commercial farm near St. John in Lateran Basilica during work on the subway.

The dig revealed a three-pronged pitchfork, storage baskets, leather fragments that may have been from a farmhand's glove or shoe, and tracks carved into stone from the repeated turning of a waterwheel.