warhistoryonline:An RAF officer inspects the hole left by a 22,000-lb deep-penetration ‘Grand
warhistoryonline:An RAF officer inspects the hole left by a 22,000-lb deep-penetration ‘Grand Slam’ bomb which pierced the reinforced concrete roof of the German submarine pens at Farge, north of Bremen, Germany. this was the result of a daylight raid mounted by 18 Avro Lancasters of No. 617 Squadron RAF on 27 March 1945, in which two direct hits by ‘Grand Slams’ caused much of the partially-completed roof to collapse. https://wrhstol.com/2z1fL4G -- source link
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