Hang on tight!

These three brave guys seem to be using power screwdrivers to unscrew the sticky-out white bits on these containers, which are being turned into a VERY expensive new development in Woolwich.  They fill up the big bags and let them down to the ground to be emptied.  And, yes, I was dawdling on the way to the gym!
Perhaps I was a construction engineer in a past life - I can't stop being entranced.....