R.A.F Bomb Damage Revealed at Fall of Brest. The Fortified entrance at the west end of the U boat pens. As Organized enemy resistance finished in Brest on September 19, a RAF. Official Photographer took these pictures of the French port. They show that the strongly built pens in which U boats sheltered were not Bomb-Proof. Several direct hits were scored in them, and although built of thick reinforced concrete with steel girders, three pens had their roofs blown in. September 21, 1944. (Photo by