NHK learned that an emergency inspection of sewerage pipes in Japan after a road cave in the Prefecture of Saitama, near Tokyo, discovered corrosion and other disorders for another 3 positions in the prefecture.

The central government ordered inspections after a great Athroughss gave the impression in the city of Yashio, the Prefecture of Saitama, on January 28. A truck fell into the hole and motor force has not yet been found. The abyss would have been caused through an underground water rupture.

The inspections were carried out in around 1,700 places in seven prefectures, Saitama, Tokyo and Osaka, which have sewers of the same length as that of the city of Yashio.

The inspectors reviewed the pipes with a diameter of more than two meters connected to the remedy factories capable of administering more than 300,000 tons of wastewater in a sunny day.

The visual inspections of human holes and the use of cameras discovered in sewerage pipes in 3 put in the prefecture of Saitama other than the city of Yashio.

Research to verify underground cavities have also been carried out special cars that release electromagnetic waves.

It is that caries that are connected to wastewater pipes, but require emergency repair, have been discovered in 8 locations.

The government soon releases the effects of inspections and takes measures to save similar caves.