Tenements 2, or T2, is the more dramatic of Heron's two Tenements sites. Divers descend the mooring to about 15 m, where a coral plateau around 12 m wide hides the main feature: a wall that drops to about 18 m, with large, flat bommies at the corner of the plateau that are excellent places to look for nudibranchs. The wall is the real attraction.

On the incoming tide, nutrient-rich water pushes up against it and shoals of fish congregate to feed, drawing in grey reef sharks, barracuda and mackerel. Marine life writers describe it as a drift towards Shark Ledge, and the resort lists the Tenements among its top ten dives for this combination of schooling fish and sharks. The dive is usually run as a relaxed drift: the incoming tide carries divers along the wall towards Tenements 1, where the dive can finish on the T1 mooring or with a pickup.

Divers should be comfortable with moving water and staying with the group, although the current is usually moderate rather than strong. T2 is a good site for Open Water divers with a few dives' experience and for photographers who want both wide-angle schooling scenes and macro subjects on the flat bommies. It is one of the best places on Heron Reef to see grey reef sharks reliably.

The Tenements pair is most rewarding when dived on consecutive days on different tides, giving two very different impressions of the same stretch of wall. Remember that the plateau hides the wall from the mooring, so newer divers should follow the guide closely on the first swim to the edge.

Heron Island is 72 km north-east of Gladstone. Fly or drive to Gladstone, then take the Heron Islander ferry from the Gladstone Marina terminal (72 Bryan Jordan Drive; check-in from 7:45 am, departs 9:30 am on scheduled days, about 2 hours), or transfer by seaplane or helicopter. Dive gear is carried on the ferry in addition to baggage.

On the island, the dive centre sits beside the harbour; boats leave the jetty for three dives daily and most Heron Reef sites are 5-15 minutes away. Tenements 2 is about 10-15 minutes from the jetty along the reef edge; divers descend a mooring to about 15 m.

Heron Reef sites are chosen on the day by wind and tide. The prevailing south-east trade winds (strongest April-September, often 15-25 knots) make the southern and south-eastern reef edge rough, so the sheltered northern and western sites are dived most. Northerly winds in spring and summer reverse this.

The tidal range is up to 3-4 m and currents run strongly around the reef edge and through Wistari Channel on springs; visibility is usually best on the incoming tide. Cyclone season is November-April; summer storms and plankton blooms can drop visibility to 10 m. Stingers are uncommon this far south but present in summer.

Tenements 2 is best on the incoming tide, which brings nutrients and concentrates fish along the wall and provides the drift towards Tenements 1.

Descend the mooring to about 15 m, swim to the edge of the coral plateau and drop down the wall to the large flat bommies at 18 m. Search them for nudibranchs, then let the incoming tide carry you along the wall towards Tenements 1, ascending to 10-12 m. Deploy an SMB for pick-up or finish on the T1 mooring.

Heron Island Resort Dive Centre is the only operator: three guided boat dives a day (about 9 am, 11 am and 3 pm) plus scheduled night dives, from the resort jetty; sites are rotated by tide and wind. Access requires a stay at Heron Island Resort (or the University of Queensland research station).