The video shows a large eel swimming in a tank with a sandy bottom. The eel is dark in color and has a long, slender body. It moves smoothly through the water, occasionally turning and twisting its body. The tank appears to be well-maintained, with clear water and no visible debris. There are no other fish or creatures visible in the tank. The eel's movements are slow and deliberate, and it seems to be exploring its surroundings.