Safety · Destination Guide
Atlantic reef and wreck adventures on Lisbon's wild side
Updated Dec 13, 2025 • 21 sources
Sesimbra diving is safe and rewarding when treated as an Atlantic environment: plan for swell, use surface signaling, and let local operators choose the right site for the day. Conservation is central because much of the coastline sits inside a managed marine protected area.
Portugal's national emergency number is 112. For non-urgent medical advice, Portugal also operates the SNS 24 health line.
Atlantic swell and surge
Exposed sites near Cabo Espichel can have surge even on days that look calm in the harbor. If the forecast is borderline, choose sheltered-bay dives instead.
Cold water and thermoclines
Upwelling can make summer water feel colder than expected. Pack exposure protection and do not underestimate wind chill on the boat.
Fishing gear on reefs
Some areas have fishing activity. Carry a compact line cutter and maintain good buddy spacing, especially in low visibility.
Boat traffic near the harbor and popular coves
Use an SMB on ascents and a float/flag for snorkel and freedive sessions. Avoid swimming across obvious navigation lanes.
The Professor Luiz Saldanha Marine Park (inside Arrabida Natural Park) uses protection zones to balance conservation with sustainable use. Recreational activities like diving are allowed, but rules vary by zone and organized groups can require permission.
Do Not Do This
Avoid entering when atlantic swell and surge. Confirm local briefings before committing.
| Contact | Role | Phone | Availability |
|---|---|---|---|
| 112 | National emergency number (medical, fire, police) | 112 | 24/7 |
| SNS 24 | Health advice line | 808 24 24 24 | 24/7 |
| Maritime Police (Lisbon Local Command) | Maritime police contacts listed by Port of Lisbon Authority | 918 498 025 / 210 911 149 | On duty |
| SEPNA SOS Ambiente | Environmental incident reporting line | 808 200 520 | On duty |