Ryfast

Ryfast is a sub-sea tunnel system in Rogaland county, Norway. The tunnel system is part of the Norwegian National Road 13 and it runs between the city of Stavanger in Stavanger Municipality, under a large fjord, and the area of Solbakk in the municipality of Strand. 
When the last section was drilled on 26 October 2017, Ryfast became the longest undersea road tunnel in the world, with its length greater than the Eysturoyartunnilin in the Faroe Islands at , the Tokyo Bay Tunnel in Japan at , and the Shanghai Yangtze River Tunnel at in China. It is also currently the world's deepest subsea tunnel, reaching a maximum depth of below sea level.
The project was approved by the Norwegian Parliament on 12 June 2012 and construction began in the spring of 2013. The cost of Ryfast is estimated to (Norwegian krone). The tunnel system replaced the ferry route between Stavanger and Tau as well as the ferry from Oanes to Lauvik across the Høgsfjorden. 
The tunnel system consists of two subsea tunnels:
The Ryfast tunnel system was built at the same time as the Eiganes Tunnel, which was constructed from a similar starting point as the Hundvåg, under the city of Stavanger, but stays in (under) the city rather than continuing undersea. The Eiganes, like the Hundvåg, opened on 22 April 2020. 