8月26日，尼泊尔喜马拉雅山区发生冰川崩塌引发的特大山洪灾害，造成1000余人死亡，数千人失踪1。灾难发生后，无人机操作员曼尼什·马哈詹加入尼泊尔陆军的救援行动，利用无人机搜救至少900名被困在12个水电项目中的失踪工人1。其中约500人被困在水电站隧道内1。
然而搜救工作面临极大困难。无人机操作员指出，隧道内"被泥浆填满，如同牙膏在管子里，没有任何空心或空的地方"1。此外，无人机在长直隧道中操作效果相对较好，但遇到弯道、转角或之字形隧道时难度大幅增加1。救援工作的关键挑战是为被困人员获得清洁水和可呼吸空气1。
A catastrophic glacial collapse triggered a massive flash flood in Nepal on August 26, killing more than 1,000 people and leaving thousands missing.1 The disaster buried workers at 12 hydroelectric projects, with approximately 900 workers unaccounted for, including about 500 trapped inside hydroelectric tunnel systems.1 Drone operator Manish Mahajan joined Nepal Army rescue efforts to locate the missing workers, but the tunnels themselves present formidable obstacles to search and recovery operations.
The flooded tunnels are densely packed with mud and debris, leaving rescue teams with severely limited options.1 Mahajan described the conditions inside the tunnels as completely filled with sediment, saying the tunnels are "full of mud, like toothpaste in a tube, with no hollow or empty space."1 The first 72 hours represent the critical window for rescue efforts, with access to clean water and breathable air emerging as key survival priorities.1 While drones operate effectively in long, straight tunnel sections, their utility drops dramatically when operators encounter curves, turns, or zigzagging passages.1
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