A heat wave of unprecedented magnitude has struck Southeast Asia, catching the region off guard. The scorching temperatures have taken a toll on outdoor workers who form the backbone of many societies in countries like Vietnam and Thailand. Phong, a motorbike taxi driver in Hanoi, has had to endure grueling conditions, working over 12 hours a day in temperatures exceeding 40 degrees Celsius (104 degrees Fahrenheit). Despite taking precautions like wearing a hat and carrying water, the heat has made his job even more challenging.