Nepal flood losses estimated at $2.56 billion, official says

KATHMANDU: In the aftermath of a massive flash flood that struck Nepal's Trishuli valley on August 26, a group of engineers has been utilizing WhatsApp to provide crucial guidance to rescue workers navigating the treacherous tunnel networks of damaged hydropower plants. This innovative approach has proven to be a valuable asset alongside traditional methods such as helicopters and heavy machinery.

Engineers set up the WhatsApp group prior to the catastrophic event, which has since become instrumental in assisting rescue efforts. The group currently boasts over 500 members, including experts from various fields. Through this platform, they have been able to share vital information, such as layout drawings, access tunnel details, and personal contact information of missing workers, in order to locate survivors.

Rescue workers have reported that the flood has significantly altered the terrain and structure of the tunnels, with debris and mud accumulating inside. This poses a considerable challenge for finding entrances and navigating through the tunnels. At the Chilime hydropower plant, for instance, authorities found over 2.2 million tonnes of mud and debris, making it difficult to locate survivors.

Despite the challenges, rescue workers have been persistent in their efforts. At Rasuwagadhi hydropower plant, workers managed to reach 250 meters into one tunnel before discovering it blocked. However, they are determined to continue their search, as at least 46 people may be trapped within its chambers. At the Upper Trishuli 3A hydropower project, rescue workers spent six days attempting to reach the tunnel entrance, which was buried under debris. They have since attempted to supply oxygen to potential survivors in case they are trapped.

Civil engineer Dhan Bahadur Tamang recounted his escape from Upper Trishuli 1 plant during the flood, describing the devastation caused by the floodwaters. He and other workers managed to find their way out through a tunnel system, but he witnessed numerous dead bodies during his subterranean journey. The flood has claimed the lives of over 1,200 people and left more than 4,000 others missing, including those potentially trapped in the tunnels.