What started as a simple exploration of a large underground pipe quickly turned into an unexpected adventure. As we followed the rushing water, we realized the tunnel didn’t just end—it opened ...

As it is believed that a sinkhole accident in Yashio, Saitama Prefecture, was caused by damage to an underground sewage pipe, the start-up aims to prevent a recurrence of a similar accident by ...

Underground Pipe Leads to Massive River Cave Posted: March 18, 2025 | Last updated: March 18, 2025 What started as a simple exploration of a large underground pipe quickly turned into an ...