There were at least four public air raid shelters built in the park to protect local residents from the Blitz. They were cut into the ground and covered over with concrete slabs and earth. One very large shelter, able to accommodate more than 1,000 people, remains intact on the park’s southern slopes although it is not publicly accessible.
On the night of 21st – 22nd April 1941, the air raid shelter near Inverdene suffered a direct hit from a German bomb with the tragic loss of nine lives. Brian Searle was at the shelter and recalls the event in his account here: https://www.bbc.co.uk/history/ww2peopleswar/stories/46/a4161746.shtml
The entrance to the Inverdene air raid shelter was uncovered in 2011 when a new sewer was being laid and the associated installation is now where the shelter used to be. In 2021, a commemorative plaque was erected on the site and it bears the names of those who lost their lives.