The shattered pane of glass had been in the roof of the Great Glasshouse at the National Botanic Garden of Wales for at least two-and-a-half years.
A crane is moved into position to help carry out the roof repairs near Llandeilo, Carmarthenshire.
Steady as you go: Workers edge their way along the glass surface.
The men are having to work in a precarious position on the glass roof.
Both the crane and the workers on the roof are visible from inside the tropical glasshouse.
Workers are lifted up inside to help in the tricky operation.
At last the broken pane of glass can be levered out.
The workers watch as the broken pane is hoisted up and away by the crane.
The replacement pane, weighing half a tonne, is finally lowered into position.
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