Chinese workers have built a subway tunnel reaching as deep as 88 metres (288 feet) under the surface of the sea.
The passage measures 8.1 kilometres (five miles) long, with 3.49 kilometres (2.1 miles) submerged under the Yellow Sea. It is the longest and deepest undersea subway tunnel in China.
It is also about 100 feet deeper than the Bosphorus rail tunnel in Istanbul, which is said to be the world’s deepest underwater railway tunnel.
Construction of the impressive cross-sea link was finished on Wednesday after having started in 2015, reported China Central Television Station.
It is part of the No. 1 Metro Line in Qingdao, an eastern metropolis with around nine million people. A former German colony, the city is dubbed China’s ‘capital of beer’ because of its famous lager Tsingdao.