In this video, a man in a military uniform is seen standing in a cave. He is holding a large tube and appears to be demonstrating how to use it. The man is speaking to the camera and explaining the process of using the tube. The cave walls are visible in the background, and the man is standing on a rocky surface. The lighting in the cave is dim, and the man's uniform is a dark color, possibly green or brown. There is no other person or object visible in the video.