Construction of the underground section of Phase II of Chennai Metro Rail may be delayed by about nine months due to a delay in the tendering process.

The initial deadline for the underground section was December 2025. The tenders for the construction of part of an underground section and some metro stations were canceled in December 2021 and are yet to be launched. Phase II project covers 118.9 km with 128 stations, including a 43 km underground section with 48 stations.

A CMRL official said the tender for the construction of an underground section from Kolathur to Nathamuni covering an area of ​​5.6