As part of SAM just been to (Grainbank) earth-house. A warden was talking about their use being to do with foodstuffs. Apparently when Martin Carruthers gives his talk on the 29th he will probably bring up that all souterrains have curved passages the point of which is that after the corner is turned the darkness closes in to keep things cool. I recollect that many souterains are noted for being entered by holes (often disguised from view) in high stream banks, basically ravines, or cliff-faces (as Petrie suggested at Saverock). Is this a defensive feature or is it advantageous for breezes and/or cooling water ?