Cincinnati’s famous beer culture dates back to the Germans who dug tunnels under the city. Denmark is at the forefront of the Cold War – how has it protected its waters? Liverpool solved its traffic problem with a mega-tunnel in the 1920s.
Beneath the streets of Cincinnati lies a forgotten underworld. At the end of the 19th century, the city was a center for German immigrants. They introduce lager beer to the United States. But they need cold temperatures to do so, so they go underground.
On the Danish coast is a state-of-the-art Cold War stronghold. These dark tunnels were once NATO’s first line of defense against Russia and its allies.
The cannons on the cliffs had enough firepower to keep the Russian Baltic Fleet out until reinforcements arrived.
The third stop in the episode is Liverpool: the construction of the Queensway Tunnel below the River Mersey is an engineering marvel and is the result of increased car numbers and congested ferry services. It was the longest road tunnel in the world when it opened in 1934.
Stories hidden in the dark
Natural caves, military bunkers and technological marvels deep under the surface – with expert accompaniment and spectacular footage, the documentary series explores underground worlds either man-made or created by Mother Nature.
For thousands of years, people have used the space under our feet. “Hidden Worlds” explore extraordinary places and reveal their stories hidden in the dark.
I am Ben Stock, a highly experienced professional with over 7 years of experience in the news industry. I specialize in market section writing and have published numerous high-quality articles on various topics under my name. My passion for journalism has helped me to develop an in-depth understanding of the industry, enabling me to stay up-to-date on all the latest trends and developments.