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The day the longest railway tunnel was opened – level 2

01-06-2001

The longest railway tunnel in the world is in Switzerland. Its...



The day the longest railway tunnel was opened – level 3

01-06-2001

The Gotthard Base Tunnel is in Switzerland and it runs under...



The day people started to make the deepest hole – level 1

24-05-1970

The deepest hole made by people is in Russia. The name...



The day people started to make the deepest hole – level 2

24-05-1970

The deepest hole ever drilled is called the Kola Superdeep Borehole....



The day people started to make the deepest hole – level 3

24-05-1970

The deepest hole ever drilled is called the Kola Superdeep Borehole....



The day Deepwater Horizon sank – level 3

22-04-2010

Deepwater Horizon was a modern oil drilling rig located in the...