Visit to the Thames Barrier, October 2009 Thanks, George.
The Thames Barrier from the south bank
Barriers open and closed
This is where we are going
Across the walkway to the first pier	Then inside and down
Down the stairs and under the Thames
Pistons which drive the barriers
Open and closed
The hydraulic pump which drives each piston	A close-up of an arm
The top of an arm	A view of the Thames from the top of a pier
Sunset	Sunset taken by George Ward