The goal is to upgrade the massive system that sends water to 27 million people, mostly in Southern California, and vast ...

Two people, a Fresno resident and a Los Angeles resident, have tested positive for measles, officials said Tuesday.

Portions of an illegal border tunnel discovered on Jan. 9 between El Paso and Juarez, Mexico, remain unfilled due to engineering challenges posed by the Rio Grande.

The “city under the ice” revealed a hidden chapter of the Cold War era and gave rise to a new field of scientific inquiry. As ice melt accelerates, its story isn’t over yet.

Archaeologists have unearthed an extensive network of tunnels, challenging existing theories about ancient engineering ...

But opposition runs statewide, with many environmentalists saying the project is a water grab that will destroy what’s left of the Central Valley’s fish populations. Anti-tunnel sentiment is ...

The critical tunnel, which transfers water from Lesotho to South Africa’s Vaal dam, was closed on October 1 for maintenance, with expectations that water would be flowing again on March 31.

"Tunnel Girl" in Herndon, Virginia, "finally" got her tunnel project approved after pausing the project due to a potential violation. Locals and social media users react.

Several states, including Florida, Georgia and Utah, are introducing legislation to limit or eliminate mandates related to fluoride, with Utah even considering a ban on its presence in water systems.