The wreck of HMNZS Waikato lies just south of Tutukaka harbour and has become a major dive site in its own right, often combined with a Poor Knights trip when the offshore conditions are too rough. The hull is mostly intact, draped in soft corals and sponges, with kingfish and large schools of trevally circling the superstructure.
A second wreck — HMNZS Tui, a former oceanographic research vessel — lies a little further north and is shallower, making it a useful site for divers building toward the deeper Waikato. Both wrecks are inside recreational dive limits, but they're best done with a local operator who knows the layout.