Road collapse raises questions about the importance of knowing the world beneath the ground

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Road collapse raises questions about the importance of knowing the world beneath the ground

The road collapse accident in Yashio City on January 28th was initially reported to have been about 10m in diameter and 5m deep, but three days later, due to collapses in the surrounding area, the hole had expanded to about 40m in diameter and 15m deep. The cause of the collapse was corrosion of a sewer pipe...