Yinmahu (NATO reporting name Modified Hansa Sonderberg class) is a semi-submersible ship of the People's Liberation Army Navy.
According to state publications, the Yinmahu's deck measures over 100 meters in length and 30 meters in width, and can submerge more than six meters underwater while the other parts of the ship remain afloat.
In 2022, the ship was photographed transporting an amphibious hovercraft.
In 2023, the ship conducted its first night-time operations training.