Construction of the alternative tunnel to existing Severomuysky tunnel on the BAM will start in May. Existing tunnel is 15,343 meters long. Its construction started in 1975 and only finished in 2003.

Feasibility study for the backup tunnel started in 2018 but suspended in 2020. Project came into life again when it was included in the implementation plans of the third stage of the Eastern Polygon modernization.

Russian Railways has awarded the contract for the construction of the second Severomuysky tunnel to Bamtonnelstroy-Most Group of Companies and a contract signed in March 2024. In February 2025, Main State Expertise of the Russian Federation held consultations on the financial and technical audit at the site of the future construction.

source is here (in Russian)