Mandale depot is right now under construction and once developed, it will be the largest Metro depot in Mumbai, with a double-decker structure
The Charkop depot will be used for the trains playing on Mumbai Metro Line 2A (Dahisar to DN Nagar) till Metro Line 2B (DN Nagar to Mandale) is commissioned, said an official from Mumbai Metropolitan Region Development Authority (MMRDA), which is the project implementing authority
https://indianexpress.com/article/cities/mumbai/metro-line-2a-to-use-charkop-depot-till-work-on-line-2b-mandale-depot-is-completed-8347599/
Source: The Indian Express
