The video shows a scuba diver swimming through a cave underwater. The cave is dark and the water is murky, making it difficult to see the diver clearly. The diver is wearing a full scuba suit and is carrying a flashlight to help navigate through the cave. The cave walls are rocky and uneven, and there are bubbles rising to the surface as the diver exhales. The diver moves slowly and carefully through the cave, exploring the underwater environment.