Two Towers is a pair of coral bommies near the southern end of Ribbon Reef No. 10, rising from about 25 m to within 5 m of the surface, with a deeper coral ridge beside them. Spirit of Freedom lists a 25 m base and 5 m apex, and it is a regular stop on both Spirit of Freedom and Mike Ball itineraries.

The site shows the Ribbon Reefs' recovery from the 2014–15 cyclones better than most. Mike Ball's photographers' guide notes that the deeper slopes were severely impacted, but the tops of both towers carry dense new Acropora growth in every colour, and they now rank among the best places on the Ribbons for young branching coral. On the south-east side is a large colony of Pavona clavus (column coral), whose top hosts colonies of red-and-black anemonefish.

The animal life is dependable. Several fully grown giant clams sit among the coral, resident green turtles are almost guaranteed, and olive sea snakes are regular. Yellow-lined snapper and fusiliers school around the towers, large moray eels live in the crevices, and spotted lagoon rays and bull rays rest on the sand. In winter eagle rays cruise the western and southern edges. Reef sharks, nudibranchs, anemonefish and mantis shrimp complete the picture.

Because it is compact and shallow, Two Towers suits divers of all levels and is excellent for long, relaxed dives and photography, particularly wide-angle shots of coral-topped pinnacles in afternoon light. It pairs well with neighbouring Lighthouse Bommie, and crews often schedule the two back to back, with Two Towers as the shallower, easier second dive of the morning.

Liveaboard only (or fly-dive via Lizard Island). Mike Ball Dive Expeditions' Spoilsport and Spirit of Freedom depart Cairns (Trinity Wharf / Marlin Marina) in the evening and steam north overnight, roughly 12–14 hours and 200–250 km, to reach the Ribbon Reefs by morning; some itineraries fly Cairns–Lizard Island (about one hour, scenic flight along the coast) and board or disembark there. Trips run 3–7 nights and include Two Towers on many Ribbon Reef itineraries.

Divers enter by giant stride from the dive deck at the mooring and descend the mooring line. The two bommies sit close together near a mooring, and the whole site can be covered in one dive.

The Ribbon Reefs sit on the edge of the continental shelf and take the full south-east trade wind from April to October. Lagoon-side moorings stay diveable in 20–25 knot SE winds, but reef-front sites and passes need lighter winds; liveaboards shelter behind the reefs overnight. September to December is usually calmest.

Tidal flow through the gaps between the Ribbons is strong on springs, so exposed pinnacles are timed for slack water. December to April brings rain, lower visibility and cyclone risk; box jellyfish and Irukandji are possible November to May. Two Towers is relatively sheltered and can be dived in moderate trades; eagle rays are most likely in the winter months.

Descend the mooring to the base of the first tower at 20–25 m, circle it and check the deeper ridge, then cross to the second tower. Visit the Pavona clavus colony on the south-east side and finish on the tops of the towers among the Acropora for a long safety stop.

Mike Ball Dive Expeditions (Spoilsport) – Ribbon Reef, Cod Hole and Coral Sea itineraries from Cairns, several departures a month; Spirit of Freedom – 3-, 4- and 7-night trips from Cairns/Lizard Island, weekly.