Hohlgangsanlage 8 was an underground hospital built under the Germans by forced labour, including Spanish Republican prisoners and, as of 1942, hundreds of Russians captured on the Eastern Front. Today, these tunnels over 1km long have been turned into a fascinating museum dedicated to the history of the occupation of the island, from 1 July 1940 to 9 May 1945. A realistic and unfliching portrayal (with documents and reconstructions) of this dark period. Troubling.