How did China build a massive underwater tunnel beneath the dangerous Yellow River in just 110 days? In this video, we ...
Germany is planning the construction of the $10 billion Fehmarnbelt Tunnel to Denmark. This video delves into the longest and ...
Germany and Denmark are separated by a strait of just 20 km, but getting from one country to the other by land involves a 160 km detour. Of course, a ferry can cross the strait in 45 minutes, but all ...