Conway enlists Carver and his chums from the local Scuba Diving club to help clean up a dock which has been a regular fly-tipping spot. However, during their expedition, one of Carver's friends finds a corpse. Meanwhile, Deakin and Lines are on the trail of one of Deakin's snouts, who has gone missing. When they hear of Carver's find, they have a suspect in mind, before the body is even retrieved. But could the death be an entirely innocent matter?