Maciço Calcário Estremenho
Gruta da Pena (Mira de Aire)
- Max depth120 m
- CertificationFull cave
- Water temperature≈ 13–19 °Cestimated, no reports yet
Diving and fills
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The dive
You dive in a large chamber with sparkling walls and a column to tie the line to; in winter the water is often crystal-clear and ~15 °C. Practical: local divers check after rain whether the cave has flooded (GUE).
Profile and sections
You dive in a large chamber with sparkling walls and a column to tie the line to; in winter the water is often crystal-clear and ~15 °C.
Practical: local divers check after rain whether the cave has flooded (GUE).
- Depth and profile
- The first ~100 m between -18 and -6 m, with ceilings up to 10 m high; then an air chamber. Explored beyond 800 m. According to AESDA (Nov 2026) the cave goes down to -120 m.
- Configuration
- A single tunnel ~3 m wide, without major restrictions in the first section (estimate for the rest).
- DPV: Not DPV-suitable (estimate)
- Entry through a well and a muddy chamber: no scooter.
Who can dive where
- At least Full cave
- Configurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
- Configuration unknown — research beforehand
- Goes down to 120 m (trimix or deco may be needed)
This is how the planner decides who in your team may dive this cave. Rules your own trip adds (organizer, a mail, the AI) show with your trip.
How to get there
The entrance is closed: a special permit from the local authorities is needed. Only in wet winters, when the normally dry cave floods; you enter the water through an artificial well of ~16 m.
Around Gruta da Pena (Mira de Aire)
FillsNo fill station known nearby
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