how deep is sydney harbour

Sydney Harbour has varying depths, but the deepest part of the harbour is a hole just west of the Sydney Harbour Bridge, near Blues Point, which reaches about 45 meters (approximately 150 feet) deep. In contrast, many other areas of the harbour have an average depth around 13 meters (42 feet), with shallower zones around 3 meters deep. The harbour floor has been mapped using advanced sonar technology showing this deepest hole as a distinct feature amidst shallower surrounding waters. Overall, the harbour floor is quite uneven, with depths ranging from a few meters up to this significant deep point at about 45 meters.