The watertight bulkheads are provided in the ship for the following purposes; Strength: provide major resistance to hogging, sagging, racking, water pressure etc. Weather survivability includes Sea State 5 survival at the best heading, and full operational capability at Sea State 3, including 20 knots (37 km/h; 23 mph) patrol speed and 10 knots (19 km/h; 12 mph) sustained … watertight compartments If one side of the hull is damaged, the water that fills the … watertight compartments in ships If a ship's hull is divided into watertight compartments, any flooding resulting from a breach of the hull can be contained in the compartments where the flooding occurs. Another characteristic of junks, interior compartments or bulkheads, strengthened the ship and slowed flooding in case of holing.Ships built in this manner were written of in Zhu Yu's book Pingzhou Table Talks, published by 1119 AD during the Song Dynasty.Again, this type of construction for Chinese ship hulls was attested to by the Moroccan Muslim Berber … effects of non-watertight