It was meant to be a simple walk in the forest to pick berries. Instead of woodland fruit, a resident of Świnoujście found something that could help solve one of the mysteries of the war.

In woodland not far from facilities belonging to the Museum of Coastal Defence - Fort Gerhard, the man came across an unusual depression in the ground. Around it lay numerous fragments of a metal structure. They did not look like random scrap. Among the scattered pieces you could see sections of aluminium sheets, parts of a structure and the remains of burnt ammunition.

One of the fragments was handed over to museum staff. That was the beginning of a story that may have started more than eighty years ago, during the Second World War.

"Even a first look showed that this was not random scrap metal. The nature of the sheet metal, the way it was riveted, traces of aircraft structures and burnt ammunition all suggested we might be dealing with the remains of an aircraft," explained Wiktor Czeszewski from the Museum of Coastal Defence in Świnoujście.

The first lead pointed to the British air force