Hall Bank is an offshore limestone reef in Gage Roads, around 5 km off the North Fremantle coast, and a regular boat dive for Fremantle-based operators. It is close to port, shallow and sheltered enough by Rottnest that it can be dived on many days when more exposed reefs are rough, and the water is usually clearer than at the inshore shore sites.

The reef rises from sand at 10–12 m to a top around 5 m. Its surface and edges carry colonies of sponges and corals, including small hard corals, sea whips and colourful encrusting sponges. The edges form ledges and undercuts with sandy patches between. Western wobbegongs and cat sharks rest under the ledges, stingarees and cuttlefish use the sand, and lionfish and reef fish such as western blue devils, buffalo bream, wrasse and morwong move over the top. Turtles are sometimes seen.

Because the reef is broad and low, it is easy to lose your bearings, and Bucket List Diver recommends Advanced training or a guide for navigation even though the depths suit all levels. Maximum depth is about 12 m, so bottom times are long.

Hall Bank suits Open Water divers wanting an easy offshore reef without the long run to Rottnest, and it makes a good second dive or checkout dive. It also works as a sheltered alternative when Rottnest's western sites are unsafe. Because it is a boat site in open water, carry a surface marker buoy and stay in touch with the boat crew, particularly when the sea breeze starts to build.

Bucket List Diver runs trips from the East Street Jetty in East Fremantle on the Swan River; the run down the river, out through the harbour entrance and north-west into Gage Roads takes about 20 minutes. Private boats can launch at Leeuwin Boat Ramp (East Fremantle) or the Fremantle Sailing Club / Fishing Boat Harbour ramps. The reef lies about 5 km off the North Fremantle coast, north of the shipping channel, so keep clear of anchored ships and the leads.

Hall Bank lies in Gage Roads, partly sheltered by Rottnest Island from the large south-westerly ocean swell but open to wind chop. Dive with wind under about 15 knots and before the summer sea breeze, which arrives around midday. North-westerlies ahead of winter fronts are the worst direction.

River outflow can affect visibility after heavy rain, but the bank is usually clearer than inshore sites.

Descend on the anchor line to the reef top at about 5–8 m, then work along the reef edges and sandy gutters at 10–12 m looking under ledges for wobbegongs and cat sharks. Stay close to the anchor, as the reef is broad and easy to lose, and return along a different edge to ascend on the line.

Bucket List Diver – regular boat dives from East Street Jetty, Fremantle, suitable for all levels with a guide recommended for navigation. Private boats and clubs also dive it.