Safety · Destination Guide
Temperate reef life, sheltered inlets, and New Zealand's most famous wreck dive
The Marlborough Sounds can feel sheltered, but they are still open water with fast weather changes, cold temperatures, and busy marine traffic. Use local operators for site selection, treat wreck penetration and currents with respect, and build conservative surface support into every plan. Conservation rules are a core part of the experience, especially in marine reserves and around sensitive seabird colonies.
For any life-threatening emergency, call 111 (New Zealand emergency services). For diving-specific incidents, contact the Diver Emergency Service (DES) on 0800 4DES 111 (0800 4337 111) for expert coordination and recompression guidance.
Hyperbaric support is not located in the Sounds itself. Christchurch has a 24-hour acute hyperbaric service for New Zealand south of Taupo, and DES can coordinate referral and evacuation pathways based on your location and condition.
Carry DAN-style dive accident cover or equivalent insurance that includes evacuation, and keep a written emergency plan on the boat.
Cold-water exposure and afterdrop
Water temperatures around 13°C to 18°C can still sap energy, especially on repeat days. Dress for the second dive of the day, keep windproof layers for the boat ride, and treat warmth as a safety system.
Tide-driven currents and unmarked reefs
DOC warns of unmarked reefs, tidal changes, and strong currents around charted rocks in parts of the Sounds. Use local operator briefings, plan entries and exits carefully, and do not push sites in strong wind.
Boat and ferry traffic in narrow channels
The Sounds are a working waterway. Always assume boats are moving fast around headlands. Divers should carry an SMB and deploy it early, and freedivers and snorkelers should tow a float and stay tight to the plan.
Wreck penetration risk on the Lermontov
Penetration adds overhead, entanglement, silt-out, and exit-route complexity. If you are not trained for wreck overhead environments, keep it exterior and enjoy the scale, marine life, and structure from the outside.
Do Not Do This
Avoid entering when cold-water exposure and afterdrop. Confirm local briefings before committing.
| Contact | Role | Phone | Availability |
|---|---|---|---|
| Emergency Services | Police, Fire, Ambulance | 111 | 24/7 |
| Diver Emergency Service (DES) | Diving medicine hotline and recompression coordination | 0800 4DES 111 (0800 4337 111) | 24/7 |
| Coastguard New Zealand | Marine emergency and assistance | VHF Ch 16 / *500 (non-urgent) / 111 (emergency) | 24/7 (emergency) |
| Rescue Coordination Centre New Zealand (RCCNZ) | National search and rescue coordination | 0508 4 RCCNZ (0508 472 269) | 24/7 |
| DOC Hotline | Department of Conservation incident line | 0800 DOC HOT (0800 362 468) | 24/7 |
| Report poaching | Illegal fishing and take reporting | 0800 4 POACHER (0800 476 224) | 24/7 |
| MPI Pest and Disease Hotline | Report marine pests and biosecurity threats | 0800 80 99 66 | 24/7 |