Tunnel

Construction of Balkans' Longest Tunnel between Sofia and Burgas Starts in Bulgaria

Bulgaria has begun construction of the longest tunnel in the Balkans, as part of the railway between Sofia and the Bulgarian Black Sea city of Bourgas.

The tunnel is located about 30 kilometres from Sofia in a mountainous area and is 6.8 kilometres long, making it twice as long as Bulgaria's current longest tunnel, in Koznitsa.

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