Water tank
Located during Niku IIIP (1996).

"About 25 meters into the bush from the vegetation line along the lagoon shore was a steel tank measuring 3 feet square by 4 feet high. It was painted white with the words “Police” and “Tarawa” dimly legible in blue. The corners and bottom were very rusty and the tank had not been watertight for a long time. The top was open, apparently rusted away, and in the bottom lay a steel ring which had clearly once been the fitting for a heavy round steel hatch that lay on the ground nearby with the words “Baldwins Ltd.–Tank Makers–London” molded into it. In the bottom of the tank were six coconut shell halves which had apparently been used as drinking cups. There were no coconut trees in the area" ("Gallagher's Clues").
Further searching in the area near the steel tank led to the discovery of the Seven Site.