The Diving Weapon is a decent time piece tracing the development of a Korean weapon system known as the Singijeon, a multiple rocket launcher made by Korean general Choe Mu-seon in 1377, during the Goryeo Dynasty.
The small, but righteous, nation of Josen develops the Singijeon long before the tyrannical Ming Dynasty can and uses the weapon’s devastating capabilities to establish its independence from Ming. It is a fun story replete with diabolical generals, furious sword play, an intelligent and beautiful woman as well as good costumes.
The movie does try to be all things to all people; that is, a romantic comedy/melodrama/martial arts/swordplay film with an abundance of characters. Even though the film tries to cram all of these themes into a couple of hours, it still has all of the elements of solid Asian historical epic making it worth your two hours to watch—I doubt you will demand the time back. Definitely not crap. I have been advised that my rating of this movie was totally off the mark. According to Bonnie Juettner, guest reviewer at large (and beloved fiancee), “this movie may require you to update your rating system, JP, with a level that is a step below the glory of Red Cliff and a step above the mediocrity of a mere ‘not crap.’ Like Red Cliff, The Divine Weapon offers compelling characters (including at least two strong women who even the most dedicated male chauvinist would not be able to help but admire), a strong story line in which you cannot help but root for the underdog, a historical education, and some awesome martial arts (though not at the level of the fight scenes in Red Cliff). Unfortunately, it also contains a horrific leave-the-room-for-this-part child castration scene–and, some things are really too horrible to put into the movies. I would call this level, ‘Almost Red Cliff,’ or possibly a Rosebud.”
J.P.'s I'm Outta Here Movie Thoughts 