Gruta do Acaia

Best time to dive

April to June; September to November

Certification & difficulty

Advanced Open Water - advanced conditions (currents/depth); dive within your training.

Snorkelling

Not a snorkel site - Limited - the fluorescence effect near the entrance can be viewed by snorkelers on sunny days, full cave requires diving/crawling

Safety notes

Narrow crawl passage (silt-out/entanglement risk), overhead environment, protected archaeological site (human remains dated ~250 and ~3,000 years found in a 2013 excavation - do not disturb), no overnight camping permitted

Permits & fees

No confirmed federal/state marine-park diving fee found; site sits within/near Parque Estadual da Ilha Grande (INEA); local caretaker access fee reported, contact via local residents - VERIFY exact amount

Permits and operators change - confirm before booking.

Location

Nearest hub: Angra dos Reis