Gunboat 611, a PLAN participant of the "August 6th" naval battle, found in a junkyard near Shanghi.
The Battle of Augest 6, 1965, occurred off the coast near the city of Shantou in eastern Guangdong Province where two ROCN submarine chasers, the 890 ton Jianmen and the 280 ton Zhangjiang were sunk by 9 boats of the PLA attack squadron.*
A view from mainland on that battle (here)
* Adopted from the "Chinese warfighting: The PLA experience since 1949"
By Mark A. Ryan, David Michael Finkelstein, Michael A. McDevitt