The opening led down 10 metres into an underground cave a few dozen square metres wide with a maximum height of around 140 cm – not enough for most adults to stand in upright.
Rescue teams are striving to establish contact with two speleologists trapped in a flooded corridor of an underground cave in Poland's southern Tatra Mountains.
The excavations carried out at the castle in Olsztyn and the hill it stands on shed fascinating light on Neanderthal life thousands of years ago.
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