The wreck of a First World War The German submarine appears after decades in the sand on a beach in northern France.
The sand change from Wissant near Calais exposes the remains of UC-61, which had stranded there in July 1917.
The crew flooded the ship and set it up. In the 1930s, the submarine had been mostly buried.
It is now becoming a tourist attraction again, although the local mayor warns that it could only be a passing visit.
Since December, two sections of the submarine can be seen at low tide about 100 meters from the dunes.
"Depending on the tides and wind, which leads to sand movements, the wreck is briefly visible every two to three years, but a good gust of wind and the wreck will disappear again," said the mayor of Wissant Bernard Bracq.
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Local guide Vincent Schmitt, however, believes that wind and tides could lead to more UC-61 being abandoned.
"Every Wissant resident knew there was a submarine here, but the wreck is mostly muddy and therefore invisible," he said.
"From time to time pieces reappear, but this is the first time we discover so much."
German submarines, known as submarines, aimed at Allied shipping during the First World War and sank hundreds of ships.
According to historians, the UC-61 is said to have sunk at least 11 ships, either by laying mines or by firing torpedoes.
On his last voyage, the submarine had left Zeebrugge in Belgium and sailed for Boulogne-sur-Mer and Le Havre to lay mines when it ran aground.
The 26 crew members surrendered to the French authorities.