Pigeon takes secret message to the grave

Submitted ⁨⁨1⁩ ⁨week⁩ ago⁩ by ⁨Flax_vert@feddit.uk⁩ to ⁨unitedkingdom@feddit.uk⁩

https://www.gchq.gov.uk/information/pigeon-takes-secret-message-grave