in india a metro rail test was successfully operated underwater for the first time in which city?
In which city in India was a metro rail test successfully operated underwater for the first time?
Answer:
The metro rail test that was successfully operated underwater for the first time in India took place in the city of Kolkata. This underwater metro rail project, known as the East-West Metro line, connected Howrah and Kolkata through an underwater tunnel beneath the Hooghly River. The successful completion of this project marked an important milestone in India’s infrastructure development, showcasing innovative engineering solutions and improving urban transport connectivity in the region.