An eyewitness who survived the devastating Sikkim tunnel explosion speaks exclusively to NDTV, recounting the terrifying moments inside the tunnel and the aftermath of the blast. The survivor, a plumber who was working inside the tunnel, describes how the incident unfolded as rescue teams continue efforts to reach those trapped. So far, 12 deaths have been confirmed, while around 20 people are feared dead. Rescue operations involving multiple agencies remain underway as authorities race against time.