In the video, a man is seen wearing a white lab coat and a snorkel mask. He is standing in front of a pool and holding a small object in his hand. The man then proceeds to put the snorkel mask on his face and submerge his head into the water. After a few seconds, he removes the mask and takes a deep breath. The man then takes the mask off his face and looks at the camera with a smile. The video seems to be a demonstration of how to use a snorkel mask.