The picture taken on February 15, 2018 in the street of Balduina's district in Rome shows a general view of a huge sinkhole that opened up the day before in Rome, swallowing six cars. No casualties were reported. About 22 families were evacuated by firefighters following the collapse. The cause of the sinkhole is still under investigation. / AFP PHOTO / TIZIANA FABI

The picture taken on February 15, 2018 in the street of Balduina's district in Rome shows a huge sinkhole that opened up the day before in Rome, swallowing six cars. No casualties were reported. About 22 families were evacuated by firefighters following the collapse. The cause of the sinkhole is still under investigation. / AFP PHOTO / TIZIANA FABI

The picture taken on February 15, 2018 in the street of Balduina's district in Rome shows a huge sinkhole that opened up the day before in Rome, swallowing six cars. No casualties were reported. About 22 families were evacuated by firefighters following the collapse. The cause of the sinkhole is still under investigation. / AFP PHOTO / TIZIANA FABI

The picture taken on February 15, 2018 in the street of Balduina's district in Rome shows a huge sinkhole that opened up the day before in Rome, swallowing six cars. No casualties were reported. About 22 families were evacuated by firefighters following the collapse. The cause of the sinkhole is still under investigation. / AFP PHOTO / TIZIANA FABI

The picture taken on February 15, 2018 in the street of Balduina's district in Rome shows a part of a huge sinkhole that opened up the day before in Rome, swallowing six cars. No casualties were reported. About 22 families were evacuated by firefighters following the collapse. The cause of the sinkhole is still under investigation. / AFP PHOTO / TIZIANA FABI

The picture taken on February 15, 2018 shows a policemen walking by a cleft on a road near a huge sinkhole that opened up the day before in Rome, swallowing six cars. No casualties were reported. About 22 families were evacuated by firefighters following the collapse. The cause of the sinkhole is still under investigation. / AFP PHOTO / TIZIANA FABI

The picture taken on February 15, 2018 in the street of Balduina's district in Rome shows cars partially buried in a huge sinkhole that opened up the day before in Rome, swallowing six cars. No casualties were reported. About 22 families were evacuated by firefighters following the collapse. The cause of the sinkhole is still under investigation. / AFP PHOTO / TIZIANA FABI