Other parts form small caves, overhangs, canyons and pinnacles after the water, encrusted with large bryozoan colonies, colourful sponges, and hydroids, anemones and soft corals.

[6] The reef is of cultural, spiritual, historical, and traditional importance to Ngāti Tama, who knew of the area as a rich fishing ground in pre-European times.

[1] In December 1998, Conservation Minister Nick Smith confirmed the reef would become a marine reserve to protect the sea sponges and corals.

[10] In December 2017, a report found the redevelopment of a nearby section of State Highway 3 could release sediments and other contaminants into the reserve.

Educational and scientific activities are allowed, provided they don't disturb or endanger the reserve's flora and fauna.