Safety · Destination Guide
Ilhabela Brazil
Shipwrecks and sanctuary reefs backed by Atlantic Forest waterfalls
Updated Jan 23, 2026 • 18 sources
Safety And Conservation
Ilhabela diving is rewarding but demands situational awareness: a working channel with currents and boat traffic, plus open-ocean exposure on some sites. Use local operators, carry surface signaling gear, and treat conservation rules (especially in protected areas) as part of your dive plan.
Top Risks
- Primary risk: Strong current and heavy boat traffic in the channel
- Secondary risk: Visibility can change fast after rain
- Emergency contact: SAMU (192)
- Safety overview: Ilhabela diving is rewarding but demands situational awareness: a working channel with currents and boat traffic, plus openocean exposure on some sites.
Dive safety
- Dive with a local operator for site selection, navigation, and surface support, especially on wrecks and channel-current days.
- Use a surface marker buoy on ascents and stay clear of the ferry route and busy traffic corridors.
- Expect variable visibility. Agree on close buddy positioning and consider torches even on daytime wreck dives.
- For deep wrecks like Principe de Asturias, only dive with appropriate training, redundant gas planning, and conservative go/no-go decisions based on sea state and current.
- Snorkelers and freedivers should use a float and flag and avoid exposed points when there is swell.
- For any suspected decompression illness or serious injury, seek medical evaluation immediately and call local emergency services.
- Ilhabela has local medical services for assessment and stabilization, but advanced care may require transfer to the mainland (Sao Sebastiao, Caraguatatuba, or Sao Paulo depending on case severity).
- If you carry dive accident insurance (for example DAN), contact their emergency hotline as soon as practical after calling local services, so they can help coordinate care and transport.
Snorkel and freedive safety
Strong current and heavy boat traffic in the channel
The Sao Sebastiao Channel is a working waterway. Use surface marker buoys, obey dive-flag rules, and avoid freediving or snorkeling in traffic lanes without dedicated support.
Visibility can change fast after rain
Summer downpours can reduce visibility in a matter of hours. Keep dive plans flexible, accept site changes, and consider macro-focused dives when the water is green.
Borrachudos (biting midges)
These tiny insects are infamous in Ilhabela, especially near vegetation and at dusk. Bring strong repellent, light long sleeves, and treat bites early to avoid irritation.
Cold fronts and swell can cancel trips
In cooler months, weather can flip quickly with cold fronts. Plan backup land activities and do not overpack your schedule with non-refundable boat trips.
Wildlife and protected areas
- Ilha das Cabras is a municipal submarine ecological sanctuary protected from hunting and underwater fishing. Treat it as no-take: do not collect, do not feed wildlife, and maintain excellent buoyancy to avoid contact with the bottom.
- In Parque Estadual de Ilhabela, stay on marked trails, respect access limits (for example the Castelhanos road rules), and pack out everything you bring in.
- Use reef-safe sunscreen, secure all gear to prevent marine debris, and avoid chasing turtles or dolphins for photos.
- If you add a trip to other protected areas in the region (such as Alcatrazes), only go with authorized operators and follow all briefing rules on distance, anchoring, and group control.
Do Not Do This
Avoid entering when strong current and heavy boat traffic in the channel. Confirm local briefings before committing.
Emergency contacts
| Contact | Role | Phone | Availability |
|---|---|---|---|
| SAMU | Ambulance and medical emergencies | 192 | 24/7 (nationwide) |
| Corpo de Bombeiros | Fire and rescue (including search and rescue) | 193 | 24/7 (nationwide) |
| Policia Militar | Police emergency line | 190 | 24/7 (nationwide) |
| Marinha do Brasil (Emergencias Maritimas e Fluviais) | Maritime and river rescue (Salvamar) | 185 | 24/7 (coverage depends on region and network availability) |
| Delegacia da Capitania dos Portos em Sao Sebastiao (DelSSebastiao) | Local maritime authority (channels, boating safety, reports) | (12) 3892-1550 / (12) 3892-1555 | Business hours for general service; use 185 for maritime emergencies |