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Dive Site Guide · Verified Route & Limits

Steve's Bommie

A legendary solitary coral seamount rising from 30m to within 10m of the surface on Ribbon Reef #3, crammed with extraordinary marine life.

Min Cert: Advanced Open Water (30m)Max Depth: 30m (10m pinnacle summit · 20m mid-tier · 30m base)Entry: Liveaboard OnlyConditions: ModerateLocation: Cairns
⚠️ Mandatory Depth & Certification Rule

MULTI-LEVEL PINNACLE: The crown sits at 10m (accessible to Open Water), but the base rests at 30m. Advanced Open Water certification is recommended to explore the deep base where macro critters and flame file shells reside.

Overview: Ribbon Reefs’ Pelagic Hotspot

Located on Ribbon Reef No. 3, Steve’s Bommie is an isolated, cylindrical underwater pinnacle that rises dramatically from a 33-metre seabed to within 5 metres of the ocean surface.

Named in memory of Steve, a beloved local divemaster who passed away in the 1980s, a memorial plaque rests on the reef at 25m. Because it sits completely detached from the main reef tract, it acts as a magnet for an extraordinary concentration of marine life.


Detailed Dive Route: The Spiral Ascent

  • Descent: Down the shot line directly to the 30m base on the northern current-facing point.
  • The Base & Critter Ledges (22m–30m): Circle the pinnacle scanning crevices for flame file shells, stonefish, and wobbegong sharks camouflaged on the sand.
  • The Mid-Section (12m–20m): Massive schools of yellow-lined snappers, bigeye trevally, and barracuda swirl around the pinnacle in tight silver tornados.
  • The Shallow Crown & Anemone City (5m–10m): Five distinct species of anemonefish (including clownfish and spine-cheek anemones) inhabit the top of the bommie, creating a world-class 5m safety stop.

Certification & Safety

  • Certification Required: Advanced Open Water (30m) recommended. Strong tidal currents can sweep around the pinnacle.

Technical Dive Profile & Navigation

1. Entry & Descent Mechanics

  • Descent Method: Direct giant-stride or negative back-roll from the boat, descending along the shot line to prevent surface drift.
  • Ear Equalization: Equalize continuously every 1 metre during the descent phase to prevent sinus or middle-ear barotrauma.
  • Compass Heading & Navigation: Set a primary heading toward the main reef structure. Maintain buddy contact within 2 metres throughout the descent.

2. Deep Section & Gas Management (14m to 30m)

  • NDL Discipline: At depths of 30m, your No-Decompression Limit ticks down rapidly. Monitor your dive computer continuously.
  • The Craig Rule: Divers certified to Open Water level (18m maximum) must stay on the upper reef shelf and never follow advanced divers down past 18m.
  • Turnaround Gas: Signal your buddy and start your ascent when the first diver reaches 110 bar (or one-third of usable cylinder capacity).

3. Ascent & 5m Safety Stop

  • Ascent Rate: Ascend along the reef wall at a controlled rate not exceeding 9 metres per minute.
  • Mandatory Safety Stop: Complete a strict 3-to-5-minute safety stop at 5 metres (15 feet) before deploying an SMB and surfacing with a 360-degree overhead scan.

Marine Life & Habitat Zones (Biologically Verified)

  • Apex & Pelagic Predators: Giant Potato Cod (Epinephelus tukula), Humphead / Maori Wrasse (Cheilinus undulatus), Grey Reef Sharks (Carcharhinus amblyrhynchos).
  • Reef Fish & Keystone Species: Giant Clams (Tridacna gigas), Clown Anemonefish (Amphiprion ocellaris), Coral Trout (Plectropomus leopardus).
  • Macro Biodiversity & Benthic Invertebrates: Mantis Shrimp (Odontodactylus scyllarus), Flame File Shells (Limaria fragilis), Leaf Scorpionfish (Taenianotus triacanthus).
  • Elasmobranchs & Marine Reptiles: Whitetip Reef Sharks, Green Sea Turtles, Hawksbill Turtles, Seasonal Dwarf Minke Whales (Balaenoptera acutorostrata).

Authoritative Sources & Maritime Records

Information on depths, marine protection, species, and historical data for Steve's Bommie has been verified against official registries and scientific archives: