A very interesting geological phenomenon which for centuries remained unexplained.
These are underground tunnels which are penetrated by seawater in the Argostoli
area. They subsequently go under the seabed, passing underground beneath the mountains
of the island, where the seawater mingles with rainwater and ends up in Sami
in the eastern part of the island. In 1963 Austrian geologists assisted in understanding
the phenomenon with the help of a large quantity of dye.