P1 On March 26, naval vessels of the First Fleet engage in a maritime drill in the East Sea to mark the West Sea Defense Day. From the front, the 1,500-ton fast frigate (FF) ROKS Busan is followed by the 450-ton PKG-class patrol vessels ROKS Jung Geungmo and ROKS Kim Soohyun (PKG 729), as well as Chamsuri-class PKMR and PKM patrol boats


P2 Sailors of ROKS Pohang perform duties on the command bridge.

P3 ROKS Pohang sailors fire a small depth charge at 9:22, the time ROKS Cheonan was hit.