Type 039 (Song)

Type 039 Song was China's first more modern indigenous diesel-electric attack submarine class, moving beyond the older Romeo/Ming lineage. Its development involved problems and revisions, but it marked a major design transition for the PLAN submarine force. Song helped China gain experience with teardrop hull forms, improved quieting and submarine-launched anti-ship weapons.

The Song class uses diesel-electric propulsion, a modernized hull form, 533 mm torpedo tubes and compatibility with torpedoes and anti-ship missiles. Noise reduction features and improved combat systems made it more capable than Ming boats, though early versions required redesign. It became a bridge from legacy submarines to the more capable Yuan family.

Operationally, Song submarines strengthened China's regional sea-denial capacity. Public reporting of a Song surfacing near USS Kitty Hawk in 2006 underscored the tactical concern posed by quiet conventional submarines in crowded Asian waters. The class remains important as a step in PLAN undersea modernization even as newer Yuan boats dominate attention.