The Haryana government is assessing whether to modify the Sector 9–Cyber City stretch of Gurgaon Metro Phase 2 from an elevated alignment to an underground one — a move that could nearly double project costs and delay completion by up to three years. According to a report prepared by the Gurgaon Metro Rail Limited (GMRL), which is implementing the project, the current cost of building an elevated metro is estimated at Rs 3.3–3.5 billion per kilometre, whereas constructing it underground would raise costs to Rs 6–6.5 billion per kilometre. In addition to the higher expense, the redesign would also lead to delays owing to fresh approvals, new tenders, and revised engineering plans. GMRL is set to submit its findings to the state government, which will make the final decision on the alignment. The idea to shift the line underground was proposed by Haryana Minister Rao Narbir Singh, who discussed it with Union Minister Manohar Lal Khattar, citing that the area is densely populated with narrow roads. He noted that underground metros are a global standard in busy urban areas and would help preserve space for future flyovers and surface infrastructure. However, he also acknowledged the need for a careful cost–benefit analysis before committing to the change. Urban transport expert Professor Pradip Kumar Sarkar cautioned that revising the design now would require restarting land acquisition, clearances, and planning processes, delaying the project by at least one to two years. Local sentiment is divided — while some residents favour the underground route to reduce traffic disruption during construction, others argue that further delays are unacceptable, as Gurgaon has already waited years for metro expansion to ease congestion. The Gurgaon Metro Phase 2 project, once completed, will provide direct connectivity between Sector 9, Palam Vihar, Udyog Vihar, and Cyber City, significantly improving urban mobility in the region.