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This is what we've found under glass wool in the wall. Fortunately without any inhabitants - it seems that my dad managed to scare all the wasps away last season.

This day was intensive and my dad and I done a lot of work. We have new floor base in one room and everything is prepared for fixing new insulation tomorrow. I must say that two days of "holidays" here are better than most of trainings I've made in my life ;)