Last winter six French speleologists organized an expedition to the calcareous hills in the north of Greece. The most important reason for this trip was to explore the Probatina chasm. This opening has the deepest descent in Europe, the second in the world. At the bottom of this 400 m hole there is a large unexplored cave 25 metres high. The small expedition then explored the canyon, 2000m high, in the Astraka range.