The husband-wife duo, Himanshu and Twinkle Kalia from Delhi, has been running a free ambulance service for ferrying patients for almost two decades now. Going beyond the call of duty, the couple fetches medicines, arranges funerals and sometimes, steps in to perform last rites as well. The duo continued their service even during the COVID-19 pandemic. As we salute the COVID heroes, let's look back at their journey and how they have helped save thousands of lives.