Facebook post by University of Helsinki

Underwater excavations in South Karelia found traces of Mesolithic and Early Early Neolithic Stone Age (10,000–6,000 years ago). These findings provide us with a clearer picture of the human occupation of the time and open up a new research path in Finnish archaeology.
Archaeologists discovered the remains of a Stone Age settlement at the bottom of Lake Kuolimojärvi in southeast Finland | University of Helsinki helsinki.fi

There are still large underwater areas in Finland that were on dry land in prehistoric times and that are waiting to be explored. The clear-water lake in South Karelia reveals new information on how people lived in the early Stone Age.