Really simple VPN to browse the web privately & securely. Unblock websites around the world with applications for Mac, PC, iOS, Android & Chrome. Tunnels and underground excavations -Tunneling techniques: Tunnels are generally grouped in four broad categories, depending on the material through which they pass: soft ground, consisting of soil and very weak rock; hard rock; soft rock, such as shale, chalk, and friable sandstone; and subaqueous. While these four broad types of ground condition require very different methods of excavation ... An industrialtunnelin Los Angeles collapsed partially. None of those rescued had major injuries, authorities said. Tunnel: Directed by Kim Seong-hun. With Ha Jung-woo, Bae Doona, Oh Dal-su, Shin Jeong-geun. A man is on his way home when the poorly constructedtunnelhe is driving through collapses, leaving him trapped.

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