Delsan Wreck, Tubbataha: Drifting the South Atoll's Wall

Diving Delsan Wreck means heading to the southeastern edge of Tubbataha's South Atoll, where the visible remains of a small freighter or barge are largely overgrown and scattered across a shallow reef top, starting around 5 metres. While the wreck itself offers little structure beyond coral-encrusted fragments, it serves as a point of reference for a dive defined by the dramatic reef topography. The dive generally begins upstream of these remnants, allowing a gentle drift over the initial shallow slope.

The main feature of this site is a large, V-shaped crevasse in the reef wall, locally known as 'The Cut'. This geological formation descends to about 30 metres and spans approximately 20 metres across, creating a natural channel that funnels water. As you drift along the upper slope, the reef transitions sharply into a steep wall that plunges into deeper water, with the crevasse acting as a focal point for both current and marine life.

Currents at Delsan are often moderate to strong, particularly as water is channeled through 'The Cut' and along the dog-leg sections of the wall. These conditions can exceed 2 knots, concentrating significant schools of fish. This dynamic environment attracts larger predators, making encounters with hunting grey reef sharks (Carcharhinus amblyrhynchos) a common occurrence. The dive profile typically involves a drift along the drop-off, allowing you to cover substantial ground with the current.

The strong currents and strategic location make Delsan one of the South Atoll's premier sites for pelagic encounters. Beyond the numerous grey reef sharks, you can expect to see whitetip reef sharks (Triaenodon obesus) patrolling the reef, alongside impressive schools of dogtooth tuna (Gymnosarda unicolor) and giant trevally (Caranx ignobilis). Great barracuda (Sphyraena barracuda) and yellowtail barracuda (Sphyraena flavicauda) are also frequently observed, often holding formation against the current.

Further enhancing the pelagic experience, the site is known for occasional sightings of tiger sharks (Galeocerdo cuvier) and hammerhead sharks (Sphyrna spp.), particularly during the peak season from March to May. These larger predators are drawn to the abundant schooling fish and the rich ecosystem sustained by the currents. Snapper (Lutjanidae family) and grouper (Epinephelinae subfamily) inhabit the wall and crevices, while green turtles (Chelonia mydas) are regularly encountered along the reef.

The visibility at Delsan is consistently good, ranging from 30 to 40 metres, offering clear views of the expansive wall and the pelagic action. This excellent visibility, combined with the often-present current, means careful buoyancy and positioning are key to fully appreciating the site. Maintaining a comfortable distance from the wall while observing the open water for passing pelagics defines the experience here.

What sets Delsan Wreck apart from other sites in Tubbataha is not its scattered wreckage, but its reputation as a consistent 'big fish' destination. The combination of its geological features, strong currents, and a healthy reef ecosystem creates a reliable environment for diverse pelagic species. It offers a distinct experience compared to purely reef-focused dives, demanding a different approach to current management and open-water awareness.