 The Haizhui-class submarine chaser is based on the Type 062I-class gunboat and entered service in the early 1960s.It was a stopgap measure as a follow on class to before the arrival of the Type 037 submarine chaser in the mid 1960s.Although Type 062I originated as a gunboat, the submarine chaser version was more successful in serving the People's Liberation Army Navy, actually serving operationally rather than a training vessel for foreign crews.