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Stockholm - Blue line extension from Kungsträdgården to Nacka C and from Akalla to Barakarby. The extension is also going to replace the segment of the Green line from Gullmarsplan to Hagsätra. Yellow line will run parallel to Green line(s) 14 and 17 and divert as an extension from Stockholm-Odenplan station to the football stadium in Solna known as Arenastaden/Friends Arena.
These proposed lines are currently under construction, the Blue line is seeing the most progress with bedrock being blasted out daily and bored through with TBM's, they are also working on two deepwater tunnels for the Blue line as it runs underneath the waters (Saltsjön & Hammarby Kanal) of Stockholm. Hammarby Kanal station will be located undernath a channel between two quarters in Hammarby, it will be our first underground deepwater station.
Estimated total cost of the proposed lines are 32 billion SEK (~€3.1 billion)
There are future plans to build an additional metro line from Älvsjö (Commuter rail hub) - Fridhemsplan (interchange station to Blue and Green line).