The four-year-old disappeared after he was last seen playing outside Oak Park Station, located about 40km south of Yunta, on September 27.
No trace of him has been found despite extensive air and land searches over the past month.
Emergency services arrived at the property this morning to drain the main dam into the southern dam to clear weed beds and allow for a “comprehensive visual search”.
The operation took three-and-a-half hours with approximately 15,000 litres of water per minute.
A total of 3.2 million litres of water was removed from the dam.
Police divers searched the main dam and the holding dam but were unable to find anything of significance.
The water was then pumped back into the dam.
The operation follows an exhaustive ground and air searches around the homestead where he disappeared.
Task Force Horizon investigators used a drone to assess the remote terrain, however, it has not uncovered any evidence.
More aerial imaging extending 10 kilometres from the property is still under way.
Taskforce Horizon consists of 12 specialists who are analysing information and suggesting different areas to search.
Police paused their most recent ground search for Gus on October 17.
No trace of Gus was found during this latest search as hot weather hampered efforts.
It followed an initial 10-day search which involved police, military personnel, SES volunteers, trackers and neighbours.
Police said investigations have not uncovered any evidence of foul play.
Gus’ family continues to cooperate fully with investigators.
SA Police Commissioner Grant Stevens previously said no stone would be left unturned in the search for Gus.
“We are dedicated to making sure we do everything we possibly can to bring Gus back to his family,” Stevens said.
