by rathbone » 18 Jan 2012, 21:17
I don't have a definitive answer for that. The ones at the Marine Gardens were dug-out, as were those at Leith Links, so it would probably be safe to assume that they were dug.
I've come across a reference to a guide to all the Edinburgh air raid shelters, including their type of construction, which was distributed by Edinburgh Corporation on 2 December 1939 and I would assume that there is a copy of that in the Central Library. That would probably give you chapter and verse.
There are also reports in the Scotsman for 1939 of basements being adapted as air-raid shelters, which would fit in with the info from Epykat about the adjoining property in Mount Lodge.
I have nothing to say and I'm going to say it.