ZCZC SA21 NCC-HAMBURG 160640 UTC JUN 26 NAV. WARN. NO 350 GERMAN BIGHT. NORTHERLY OF HELIGOLAND. UNDERWATER OPERATIONS BY 'SCOTIA' CS 'LANJ8' IN AREA ABOUT 54-226N 008-010E RESTRICTED MANOEVRABILITY DURING OPERATIONS. BERTH OF 1 NAUTICAL MILE IS REQUESTED. NNNN