Presented on the right is a figure of the total amount of average clicks recorded per hour, over a period of seven weeks by the 10 CPODs in the laguna pool. The recordings have been divided between CPODs located in the shallow area, the slope and the deep area. The recordings from the shallow and the deep area have been compared with a two sample T-test, which indicates that the deep area has a significantly higher amount of recorded clicks compared to recordings from the shallow area.