This video captures the underwater world of two cuttlefish. The first cuttlefish, with a blue and white patterned body, is seen swimming towards the second cuttlefish, which has a brown and white patterned body. The first cuttlefish then appears to attack the second one, using its tentacles to grab and hold onto the other cuttlefish. The second cuttlefish tries to defend itself, but the first one overpowers it. The video ends with the first cuttlefish swimming away, leaving the second one behind.