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The 6 Largest Underground Structures Around the World

Underground structures are some of the most impressive construction projects ever. They are marvels in their own right. Here is a list of the 6 largest underground structures all around the world.

Ukraine’s Deepest Subway Station

It takes the average person at least a 5-minute escalator ride down to reach Ukraine’s Arsenalna metro station. The station lies directly underneath the hilly town of Arsenalna by the Dnieper River. First opened in 1960, this underground station lies far below the surface, ascending to its next stop at ground level.

Depth: 346 feet

Location: Arsenalna in Kyiv, Ukraine

Australia’s Massive Basement

The Sydney Opera House is already one of the most famous buildings in the world. However, not many people know about its gigantic basement. It’s basically a 12-story parking garage that extends 91 feet below sea level. It also has a unique double-helix design that both maximizes underground parking space while staying up to strict safety protocols.

Depth: 120 feet

Location: Sydney Opera House, Australia

Switzerland’s Longest Underground Tunnel

The Gotthard Base Tunnel cuts through the Swiss Alps to form the largest underground tunnel in the world. First opened in 2016, this tunnel runs from north to south and connects Erstfeld to Bodio. The deepest point within the tunnel is 8,040 feet below the surface. If it wasn’t for the high-quality ventilation system, temperatures would easily reach upwards of 115 degrees within this tunnel.

Depth: 35 miles long

Location: Near the Swiss Alps

California’s Deepest Building Foundation

You might think a regular-sized skyscraper is tall enough above ground. The Salesforce Tower in San Francisco, California already stands at a massive 61 stories above ground. Below ground, the building extends an additional 310 feet more. The foundation alone is made up of 49 million pounds of concrete to create a 14-foot thick and 1-acre wide slab below the surface.

Depth: 310 feet below existing grade

Location: Salesforce Tower, San Francisco

Turkey’s Biggest Underground City

Underground construction is not a new concept. There are still underground cities like the one in Cappadocia, Turkey that date all the way back to 1200 B.C. This city is 18 stories deep and was first discovered in 1963 by accident. A Turkish man knocked his basement wall, only to find miles of tunnels sitting behind it.

There are now over 600 different entrances to this underground city found all over the city. Miles upon miles of more than 200 different underground cities are all carved into this volcanic rock below.

Depth: 18 stories deep

Location: Cappadocia, Turkey

China’s Gigantic Underground Research Facility

Underground research facilities are more common than you might think. Researchers typically take their work underground due to lowered cosmic radiation pollution. Under the Jinping Mountains in Sichuan, China, researchers study dark matter in a facility that is nearly 8,000 feet deep. It is surprisingly easy to access, with a horizontal road carved directly to the site.

Depth: 7,900 feet deep

Location: Jinping Mountains of Sichuan, China

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