Apparently on display are the remains of a CHT-02D torpedo's contra-rotating propellers, propulsion motor and a steering section (matches the schematics found in export brochures). But why is anything left of the torpedo? There was no impact, just an underwater explosion 3 m from the ship which created a destructive shockwave and bubble effect.
Also on display at the Seoul War Memorial are myriad WWII and Korean War toys such as a mother of a Boeing B-52 Stratofortress, SAMs and those H-13 helicopters right out of M*A*S*H.
The PKM Chamsuri was seriously shot-up with 6 dead and 18 wounded from a skirmish with a DPRK vessel in June 2002, just a month after I visited North Korea.
Some of the Gyeongbok Palace -- or whatever is left owing to nearly a century of abuse from foreign powers:
View from the Seoul Tower: