During the Occupation the German forces excavated numerous tunnels in Guernsey, these were used for various purposes and many still survive today. At the centre of the Underground Hospital complex the link gallery on the right leads off to Ho.40. The unlined central gallery lies behind steel mesh in the centre of the photo with the first ammunition storage chamber of Ho.7 appears on the left.
During the Occupation the German forces excavated numerous tunnels including this unlined one in Alderney. Here we can see the remaining timber from the collapsed lining mixed with fallen rubble. Several of the small storage chambers of this small complex can be seen on both sides. This highlights the dangers of exploring unlined tunnels.