What is the UK's Biggest Chamber ?

[mikem]

It's still a permit from the estate, whoever administers it. Reservoir hole isn't on access land.

 

[mikem]

Anyway, Calder's Geo on Shetland is the largest chamber in UK (as announced 2014 & it's a sea cave)

Mike

 

[mrodoc]

The Frozen Deep is currently  the largest chamber in the U Knot open to daylight and that is what makes it unique. Nuff said.

 

[mikem]

Expect you could easily fit the Frozen Deep in the parts of Calder's Geo that don't get illuminated - it faces west & has a large headland to the south (between it & the sun!)

They are, all 3, unique.

Mike

 

[Martin Laverty]

Is the Calder's Geo chamber (or is it just a big passage?) a separate 'Subterranean passage' to that shown (schematically) on the OS maps? https://www.bing.com/maps/?v=2&cp=60.4907~-1.6218&style=r&lvl=15&sp=Point.60.4907_-1.6218_Calder%27s%20Geo___

 

[mikem]

No, it's not the passage shown going through the headland, it's entrance is much smaller than the rest of it.
https://www.bbc.co.uk/news/uk-scotland-north-east-orkney-shetland-28965618

Mike