The skill of the men demolishing a huge shed is quite incredible.  Those on the high platforms easily manipulate their machines in tight places to reach girders many metres above ground.  Then they use acetylene torches to cut through the metal before other large excavators grapple the girders then very skilfully lower them down. The site is full of very busy men all with different machines and jobs to be done in clearing the large site of buildings to make way for housing.