Reliance Infrastructure holds a 95 per cent stake in Delhi Airport Express Link and owns 69 per cent of Mumbai Metro Line I and 49 per cent of Mumbai Metro Line II.
The Line II tunnel was formally opened Monday by Bulgarian Minister Boyko Borisov, Finance Minister Simeon Djankov, Sofia Mayor Stoyanka Fandakova, and Chief Sofia Architect Petar Dikov.
Metro Station 8 of Line II of the Sofia Metro has been described as the probably the most complex underground facility in Sofia.