South Korean UDT/SEALs engage in knife training aboard a ship in the Gulf of Aden.
South Korea's elite unit of frogmen have longstanding ties to US Navy SEALs, but some of their techniques, like a recent video displaying their knife training, show their unique style of close-quarters combat.
South Korean media reports that Korean SEALs have trained with the US's SEAL Team 6 - the same group that took out Osama Bin Laden - to form an elite unit to take out North Korea's Kim Jong un.
In the slides below, see the Korean SEALs training in combat gear and practicing a fearsome knife-fighting regimen with blinding speed and complexity.