There was a bit of drilling to insert cables but any dust was cleaned up. The digicam is just not obtrusive and gives a good photograph. Visualize being able to get boat outings in the city. Among the biggest and many scenic freshwater lakes in China: ruined. Almost 300 km2 https://thetopvideotube.blogspot.al/search/label/url-HHsGyDomCQKwyFArt3CDokfJX