ZCZC SA24 NCC-HAMBURG 010020 UTC SEP 26 NAV. WARN. NO. 487 GERMAN BIGHT. TSS 'TERSCHELLING-GERMAN BIGHT'. UNDERWATER OPS BY MV 'IEVOLI COBALT' CS 'IBOK' BETWEEN POSITIONS 54-162N 007-043E AND 54-168N 006-505E RESTRICTED MANOEVRABILITY DURING OPERATIONS. BERTH OF 1 NM REQUESTED. NNNN