Luganville tide times

Luganville is the main town of Espiritu Santo, Vanuatu's largest island, situated on the southeast coast of the island on the Second Channel — the passage between Santo and the smaller Aore Island offshore. The town grew from a World War II US military base: the Americans constructed roads, airstrips, and port facilities across the island between 1942 and 1945, and the infrastructure legacy is still visible. At the end of the war, the US military dumped vast quantities of equipment, vehicles, and munitions into the shallow water off Million Dollar Point rather than sell them to local colonial authorities at a reduced rate. Today that dump is a snorkelling and diving site.

The headline attraction is the SS President Coolidge. This 22,000-tonne former luxury liner, converted to a US troop transport, struck two American mines at the harbour entrance on 26 October 1942. Captain Henry Nelson ran the ship aground on the reef to avoid sinking in deep water, allowing 5,050 of the 5,052 men aboard to survive. The Coolidge now rests on a slope from 21 m at the bow to 73 m at the stern, accessible from shore by wading in at the Coolidge dive site (signposted from the main road). The wreck is one of the most accessible and intact large ship dives in the world.

The tidal regime at Luganville is mixed semidiurnal, consistent with the broader Vanuatu pattern. Spring range approximately 1.0–1.3 m above Chart Datum. Tidal current in the Second Channel — between Santo and Aore — runs at 0.5–1.0 knots on spring tides, direction alternating with the tidal phase. For Coolidge diving, the current over the wreck is a primary operational variable: the bow section at 21–35 m sits in the open channel where spring tidal current can run at 0.7–1.0 knots. Most operators plan entry during the slack-water windows around the tidal turns — the 30–45 minutes of negligible current around high and low water — to allow controlled buoyancy work inside the wreck's penetration sections.

The Coolidge interior includes the famous Mast Head, the American Lady figurehead in the first-class lounge at 42 m, and the Pool Deck, all accessible to experienced divers on guided penetration dives. Photographers working the interior need natural light for the shallowest sections (21–28 m) and strobes for the deeper sections; the best natural-light window is 08:00–11:00 when the sun angle is high enough to penetrate the water and illuminate the wreck's exterior. Visibility runs 15–25 m on the flood when oceanic water moves through the channel; on the ebb, runoff from Santo's rivers can drop visibility to 8–12 m after heavy rain.

Million Dollar Point is a separate shallower site 3 km west of the Coolidge: tanks, trucks, jeeps, and bulldozers covered in coral at 5–25 m, snorkellable from shore at high tide when the shallow sections carry sufficient depth. At low spring water, the shallowest jeep roofs are less than 1 m below the surface — excellent for snorkel observation but too shallow for safe scuba diving without impact risk.

For anglers, the Second Channel is productive for trevally, snapper, and grouper along the bottom structure of the old wharf pilings at the eastern end of Luganville's waterfront. The flooding tide concentrates fish on the upcurrent side of the pilings; the ebb concentrates them on the downstream shadow. Dawn fishing on either tidal phase produces more aggressive feeding than midday.

Luganville's freshwater Blue Holes — spring-fed pools in the jungle south of town — are not tide-dependent but are best visited in the morning before tour buses arrive. The coastal and wreck environments are the primary tide-dependent activities.

All tide predictions for Luganville come from the Open-Meteo Marine gridded model. Timing accuracy is ±45 minutes; height accuracy is ±0.3 m above Chart Datum.