The watertight compartment technology of Quanzhou ancient ship unearthed in Song Dynasty took a step forward. The transverse bulkhead of the ship is surrounded by ribs at the bottom and both sides and beams under the deck, which is not only beneficial to water tightness, but also increases the strength of the structure, killing two birds with one stone.

The bulkhead plate is connected with the hull plate by flat iron and hook nails, and the gap is filled with tung oil ash, which has strict waterproof effect. 1982 Another South Song seagoing ship was found in Fashi, Quanzhou, which also adopted watertight bulkhead structure, and its bulkhead and hull plate were nailed together with iron square nails and wooden hooks.