Safety · Destination Guide
Oahu Hawaii Usa
Wrecks off Waikiki, lava caverns out west, and summer shore-diving windows up north
Updated Oct 30, 2025 • 24 sources
Safety And Conservation
Plan early, carry signaling gear, and follow protected-species distances. Hawai'i enforces reef-safe sunscreen restrictions and MLCD no-take rules.
Top Risks
- Primary risk: Winter North Shore surf
- Secondary risk: Boat traffic near Waikiki
- Emergency contact: Emergency Services (911)
- Safety overview: Plan early, carry signaling gear, and follow protectedspecies distances.
Dive safety
Check surf and wind before any shore entry. Use mooring lines for descents and ascents on wrecks. Tow an SMB where boats operate. Avoid overheads without training and do not penetrate deteriorating structures.
For emergencies call 911. O'ahu hosts a 24-7 Hyperbaric Treatment Center in Honolulu that treats decompression illness. Divers Alert Network offers a global emergency hotline and coordination.
Snorkel and freedive safety
Winter North Shore surf
Large swells close shore entries and create strong surge. Plan boat dives on south or west coasts.
Boat traffic near Waikiki
Many moorings and tour boats. Always tow an SMB and ascend on lines.
Box jellyfish cycles
Avoid south shore swims 8-10 days after the full moon. Check lifeguard postings.
Wildlife and protected areas
Use mineral reef-safe sunscreen. Do not touch or stand on coral. Observe MLCD regulations at preserves like Pupukea-Waimea and Hanauma Bay. Keep your distance from turtles, monk seals, dolphins, and whales per NOAA guidance. Pack out all trash and avoid feeding fish.
Do Not Do This
Avoid entering when winter north shore surf. Confirm local briefings before committing.
Emergency contacts
| Contact | Role | Phone | Availability |
|---|---|---|---|
| Emergency Services | Police, Fire, EMS | 911 | 24-7 |
| DAN Emergency Hotline | Diving medical assistance | +1-919-684-9111 | 24-7 |
| USCG Sector Honolulu Command Center | Maritime rescue coordination | 1-800-552-6458 | 24-7 |
| NOAA Marine Wildlife Hotline | Report injured or harassed turtles, seals, dolphins, whales | 1-888-256-9840 | 24-7 |