D.C. Water is making progress with an initiative that aims to clean up the District’s waterways — the Potomac River tunnel ...

While kayaking along the Etowah River, explorers entered a narrow mine tunnel carved through solid rock. Strong currents and limited visibility quickly turned the passage into a serious risk. Cameras ...

The first four tunnel boring machines are coming to New Jersey to build the Gateway rail tunnel. Here's what they do and why they're the safest method.