In the video, a person is seen welding a car underneath. The person is wearing protective gear, including gloves and a mask. The welding torch is being used to join two pieces of metal together. The person is working carefully and steadily, ensuring that the weld is strong and secure. The sparks from the welding torch are bright and intense, indicating that the welding process is active. The car appears to be elevated, possibly on a lift, to provide easier access to the underside. The environment around the car is dimly lit, with the main source of light coming from the welding torch.