To provide a closing system for closing an opening of a passage of pipes, ducts, bus channels, and electric cables passing through a partitioning wall of a vessel.

The closing system for closing the opening of a passage of the pipes, pipe channels 19, the bus lines, and the electric cables 20 passing through the partitioning wall of the vessel such as a bulkhead or the deck with 60 min fire resistance known as an A 60 grade, a lower grade and under water head, the opened opening 15 is lidded with a modular filling element 12, and the lid is covered with a noncombustible elastic sealing material 13.