Letter sent on 12th May 2020 from Krzysztof Zyman, Secretary of the Bern Convention to Valeri Georgiev, Head of Biodiversity Unit, National Nature Protection Service Directorate, Ministry of Environment and Water. Subject: Possible on-the-spot appraisal visit to Bulgaria within the framework of the Complaint No. 2001/4: Possible file: Motorway through the Kresna Gorge.