 Churchill then sought information about building Britain's own gaseous diffusion plant, a heavy water plant and an atomic reactor in Britain, despite its immense cost. However, in July 1943, in London, American officials cleared up some major misunderstandings about British motives, and after many months of negotiations the Quebec Agreement was signed by Churchill and Roosevelt on 19 August 1943 during the Quebec Conference. The British handed over their material to the Americans and in return received the copies of the American progress reports to the President. Tube Alloys was subsumed into the Manhattan Project.
