Many of Ukraine's historic monuments have been destroyed in the three months since Russia invaded, but cultural experts are working to conserve their memory using cutting-edge technology and 3D scans. One of them is volunteer, French engineer Emmanuel Durand, a specialist in 3D data acquisition, who is assisting a bevy of architects, engineers, historical buidling experts and a museum director to record buildings in Kyiv, Lviv, Chernigiv and Kharkiv. Durand steps over a jumbled pile of beams and crunches over the rubble that was once Kharkiv's 19th-century fire station. He plants his laser scanner, a sort of tripod with a pivoting head, in a stragetic corner of the severely damaged building. IMAGES AND SOUNDBITES