Emergency declared at US Hanford nuclear waste site after tunnel collapse

The US Department of Energy has declared an emergency at the Hanford, Washington nuclear waste storage site, after a cave-in of a tunnel used to store radioactive materials and equipment.

Key component of world's longest cross-sea bridge installed (video)

Chinese engineers installed a 6,000-ton key structure of the world's longest cross-sea bridge linking Hong Kong, Zhuhai and Macao.

In Switzerland opens the longest and deepest tunnel in the world

Under the Swiss Alps will open the longest and deepest railway tunnel in the world. The tunnel length is 57 kilometers. Depth of 2.3 kilometers, the BBC reports.