Safety · Destination Guide
Algarve (Lagos)
Atlantic reefs, cliff caves, and easy Algarve road trips from a sunlit harbor town
Updated Dec 13, 2025 • 22 sources
Safety And Conservation
Algarve diving is generally straightforward, but it is still Atlantic water: surge, changing visibility, and boat traffic are the main hazards. Plan conservatively, dive with reputable operators, and keep emergency numbers accessible.
Top Risks
- Primary risk: Atlantic surge at cave mouths and walls
- Secondary risk: Boat traffic in peak season
- Emergency contact: European Emergency Number (112)
- Safety overview: Algarve diving is generally straightforward, but it is still Atlantic water: surge, changing visibility, and boat traffic are the main hazards.
Dive safety
Operational Safety
- Dive with a local guide if you are new to Atlantic conditions or cave-style terrain.
- Use a surface marker buoy (SMB) for ascents, especially near popular cliff caves with boat traffic.
- Respect depth and no-decompression limits. Build in longer surface intervals if doing multiple days.
Environmental Safety
- Surge can be strong at cave mouths and cliff walls. If conditions build, switch to protected sites.
- Visibility can drop quickly after storms. Follow local briefings and do not push navigation or overhead environments in low vis.
Personal Safety
- Cold exposure is common outside midsummer. Dress for the water, not the air.
- Stay hydrated and avoid heavy drinking before dive days.
If Something Goes Wrong
- Call 112 for emergency medical services.
- Contact your dive insurance provider or DAN hotline as soon as practical.
- For suspected decompression illness: keep the diver warm, provide oxygen if trained/equipped, and do not delay medical evaluation.
Hyperbaric Support
The Algarve region has private hyperbaric medicine capability, and the local medical system can coordinate care and referral based on the case.
Snorkel and freedive safety
Atlantic surge at cave mouths and walls
Surge can pin divers into rock or make exits difficult. If the sea state is up, skip caves and choose protected shore sites.
Boat traffic in peak season
Tour boats and kayaks concentrate near cliff caves. Use an SMB for scuba ascents and a float/flag for snorkeling and freediving.
Cold exposure and cramps
Even on hot days, Atlantic water can feel cool over long sessions. Bring appropriate wetsuit thickness and consider a hood in colder months.
Visibility swings after storms
Expect reduced visibility after swell and rain, especially on shallow sites. Build flexibility into your plan and follow local guidance.
Wildlife and protected areas
Leave No Trace Underwater
- Do not touch, collect, or move marine life, shells, or artifacts.
- Maintain buoyancy to avoid fin damage to fragile habitats and to keep visibility clear for the group.
- Avoid anchoring on reefs and sensitive areas; use established procedures and operator moorings where available.
Wildlife and Boat Tours
- Choose dolphin and wildlife operators that brief respectful viewing behavior.
- Never chase or surround marine mammals, and keep noise low around wildlife.
Do Not Do This
Avoid entering when atlantic surge at cave mouths and walls. Confirm local briefings before committing.
Emergency contacts
| Contact | Role | Phone | Availability |
|---|---|---|---|
| European Emergency Number | Police, fire, medical emergency dispatch | 112 | 24/7 |
| Capitania do Porto de Lagos (Autoridade Maritima Nacional) | Maritime authority and local harbor coordination | 282 788 464 | Business hours; emergencies via 112 |
| Grupo HPA Saude (Hospital Particular do Algarve) | Hospital services and hyperbaric medicine capability (Alvor/Portimao area) | +351 282 420 400 | 24/7 (hospital), call for triage |
| DAN Emergency Hotline (Divers Alert Network) | Dive medicine advice and assistance coordination | +1-919-684-9111 | 24/7 |