Since the threat may occur on any type of vessel, anywhere on the ship, the problem of the ship’s bullet resistance should be considered significant. In each of the cases presented, human life must be protected while serving at sea. The situation is different for ships for which a private shipowner or oil company usually does not employ trained intervention groups. In the case of warships, appropriate patrols may be organized in case of risk. Increasing acts of piracy and the multiplicity and variety of asymmetric threats require remedial measures. The remote location of the attack proves that the pirates have specialized equipment, skills, and better weapons. In 2008, the supercontainer “Sirius Star” was hijacked in south-eastern waters around 450 miles off the coast of Kenya. An example of a terrorist threat which has recently developed is piracy. Such an attack can occur from a motorboat, other watercraft, or even a drone. Taking into account the threat of asymmetric conflicts, there is a possibility of damaging the interior of the ship using small-caliber weapons. Increasing the thickness of the superstructure plating increases the height of the center of gravity, which affects the stability of the ship, and therefore they are relatively thin. In the case of watercraft, another important parameter is the mass above the center of gravity. These materials, in most cases, have almost no bullet resistance. To reduce the ship’s magnetic field, glass-polyester laminates were also used.
Nowadays, armored units are no longer used, which, along with the development of the quality of the produced steel and changes in the concept of war at sea (reduction of the use of artillery projectiles), has changed the thickness of the ships’ hulls. In extreme cases, it can be from 3 mm for mine warfare ships to even 650 mm on the 1941 battleship “Yamato”. The thickness of the hulls of warships depends on their combat purpose.
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