A South Korean subway tunnel under construction suddenly collapsed on Friday just south of Seoul, the AP reports. South Korea ...

This lining eventually grows into a strong, waterproof tunnel -- perfect for your subway! The cut and cover technique is another, equally effective way to build a shallow subway tunnel beneath the ...

A subway tunnel under construction near Seoul collapsed on Friday, leaving two workers presumed to be trapped at the site, officials said ...

We wanted to know: What could repurposing Cincinnati's abandoned subway tunnels look like in the 21st century? The city's official call for ideas last fall resulted in 18 submissions that we ...

Last fall when Cincinnati asked for ideas for what to do with its empty, 2.2-mile abandoned subway tunnel system, many Enquirer readers and social media commenters had the same response ...