Contained in a transparent glass container, documents in German bearing the date 1864 and coins from the second half of the 19th century can be seen.
The reaction of the Polish authorities to the ecological catastrophe on the River Odra will be the subject of criminal proceedings by the country's prosecutor's office, Zbigniew Ziobro, the justice minister, announced on Wednesday.
Around 10 tonnes of dead fish have been pulled out of Poland’s River Odra in what the CEO of the state-owned company Polish Waters has called "an outrageous ecological catastrophe."
The Polish government has called in troops to help clean up River Odra following a pollution spill that has killed thousands of fish.
Declared extinct by ecologists in 2002, the 2.5cm Black Bee has now been spotted in six permanent habitats after ecologists urged Facebook users to send in photos.
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