Archeologic excavation

The local soil is moist, groundwater is high, deep cellars were not dug here in the old times. Wood, leather, pieces of birch bark with letters, not to mention weapons, coins and other 'swag' are perfectly preserved in this soil. But for more than 80 years of systematic excavations less than 5% of the city's territory has been explored nowasays. Digging and digging are ahead...