Capel Celyn village and farms of the Tryweryn Valley disappear beneath the waters of a reservoir so Liverpool’s thirst may be slaked. Wales’ powerlessness was exposed and protests involved members of the Free Wales Army and Mudiad Amddiffyn Cymru. Pupils and staff of Friars School in Bangor filmed the demolition and construction work from start to finish and have produced what might have been regarded as an objective record of an emotive event.