MUMBAI: A permanent protection wall is being planned at the under-construction Acharya Atre Chowk station on Metro Line 3 to prevent a repeat of Monday’s flooding incident, which left the station inaccessible for the second day on Tuesday. The structure will be designed to withstand extreme weather events, Mumbai Metro Rail Corporation Ltd (MMRCL) managing director Ashwini Bhide said, adding the flooding was triggered by a sudden and intense downpour.Train services between Worli and Acharya Atre Chowk remain suspended and will resume only after all systems pass safety and functionality checks. Meanwhile, services between Aarey and Worli via JVLR are operating normally.“This was a rare, high-intensity event where nearly 11 lakh litres of rainwater entered an under-construction pit within one-and-a-half hours. The pit couldn’t sustain the volume, leading to soil erosion and water ingress into the station, which reached the concourse and platform levels,” Bhide said.While a temporary bund wall was already in place at the entry/exit point, it was not designed for such an extreme scenario. “We are mindful that such weather extremes can recur. A permanent wall is being constructed that will offer long-term protection. This will take a couple of months, and once the entry/exit works are completed, these issues will no longer persist,” she said.MMRCL earlier said the flooding was caused by the collapse of a reinforced concrete cement (RCC) retaining wall at an entry/exit point due to sudden water ingress from a nearby utility trench. The structure is still under construction and not accessible to the public.Bhide added while Acharya Atre Chowk station was impacted, the rest of the corridor functioned smoothly even under intense rainfall. “Our train reversal system is beyond Acharya Atre Chowk. Since tunnels and tracks were unaffected, operations could continue normally on the remaining stretch.”Water at the platform and concourse levels was pumped out, and dewatering of the undercroft area was underway. Engineers conducted detailed inspections of station infrastructure. Escalators, elevators, AC, ventilation systems, power supply, signalling relays, and fire detection panels are being tested for damage, corrosion, and operational stability.