Well done CAT. You answered the two key questions: Rochester Cathedral Crypt and the old (Gundulph) East End. Bragging rights are withdrawn though, no Roman buildings in that shot. The excavation was at the centre of the East End where according to both Palmer and St. John Hope there was the silver shrine of St. Paulinus (sometime Bishop of Rochester and first Archbishop of York; died 10 October 644) projecting beyond the wall. St. John Hope reported finding a decayed wooden coffin and bones in this projection. In 2015 excavations rediscovered this projection and that is the deeper part shown. Two, as yet undated, long bones were found there. Is is possible, but not proved, that this is the last resting place of St. Paulinus and the bones may be his.