A reef on the south side of Agios Georgios where the descent runs through a passage. The entrance is at 14 metres, the tunnel drops to 22 past small assorted pinnacles, and it opens onto a plateau of sponges, corals and varied sea life. The depth range runs to 29 metres, and the operator asks for Advanced Open Water and advises nitrox.
Also known as Chimney.
Where it is and how deep
39.1305° N, 23.8005° EApproximate position — the dashed circle shows where the site lies; your operator's briefing has the mooring.
The dive
The entrance is at 14 metres, on the south side of Agios Georgios. From there the descent is the feature: you drop through a passage, a tunnel that takes you down to 22 metres, with small assorted pinnacles standing along the way. It is a vertical route rather than a swim along a face, so the first part of the dive is spent going down rather than along.
The tunnel then opens up into a plateau with sponges, colourful corals and varied sea life, and the site's stated limit is 29 metres. The certification bar reflects that: the operator asks for Advanced Open Water and advises nitrox. Plan the gas around the deep first half, since the descent through the chimney comes at the start of the dive rather than being a feature you save for later.
Marine life and season
The sources we used don't single out particular species here.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Off-season | Off-season | Off-season | Fair | Good | Prime | Prime | Prime | Prime | Good | Off-season | Off-season |
Season follows Alonissos & the Peristera Wreck: The underwater museum and most operators run May–Oct only; meltemi winds can close the exposed Peristera site in midsummer.
Know before you go
- The descent runs through a passage from 14 m down to 22 m - an overhead section right at the start, so carry a light and fix the buddy order before you drop in.
Questions divers ask
What certification do you need for The Chimney?+
The operator recommends Advanced Open Water and advises nitrox. The depth range runs from a 14 metre entrance to 29 metres, with the tunnel descent taking divers from the entrance down to 22 metres early in the dive.
Sources
- The Chimney — Alonissos Triton Dive Center
- Alonissos Triton Dive Center dive sites — Scubaverse
More dive sites in Alonissos & the Peristera Wreck
Wall from 8 m to 30 m, with rock running on to 50 m
The shallow half of the cove, with its best rock at 8 to 20 m
Reef
One of the area's dive highlights, and an ideal night dive
Wall to 20 metres, then into the most famous cave on Alonissos
Cave & cavern
A 70 m cave passage with its mouth between 22 and 34 m
A sharp drop to 50 m with openings and cracks in the face
A boulder-strewn plain further offshore than the West side
Often ends in a small cave full of young fish
Similar dives elsewhere
A marine cave to 19 m opening onto a reef that drops past 30 m
Cave & cavern
Big Cave
Kemer & Tekirova · Turkey
Surfacing inside the rock among stalactites and stalagmites
A cave below the Eden Roc hotel, wide enough to swim through
.jpg){kind=link}
Barracuda at the cave corner and an open chamber to surface in, off-season