Photo : PTIKolkata Rain Havoc: Kolkata came to a standstill on Tuesday as six hours of torrential rain unleashed a chain of chaos across the city. From waist-deep water on arterial roads to paralysed Metro services, cancelled flights and loss of lives, the downpour showed how vulnerable the city remains to extreme weather. Kolkata Metro Blue Line Halted for 13 HoursThe city’s North-South Metro corridor, often described as Kolkata’s lifeline, faced its longest-ever disruption of 13 hours after floodwater entered the tunnels between Rabindra Sarobar and Tollygunge, as per a TOI report. Kolkata Rain Wreck: 10 Deaths ReportedThe heavy rain also turned deadly. Kolkata Rain Havoc at a Glance