056 corvettes Weihai(590), Fushun(591), Datong(580), Yingkou(581) assigned to the NSF conduct a 7-day drill.

Footage: 056 corvettes Weihai(590), Fushun(591), Datong(580), Yingkou(581) assigned to the NSF conduct a 7-day drill. pic.twitter.com/EXIFrPzq7p

— dafeng cao (@xinfengcao) March 8, 2017