 OYK-5 is a reserve section that is only activated in wartime or a declared state of emergency.It is made up of reservist personnel from the DYK and Officers and Petty Officers from the instructor body.ΟΥΚ-5 is a deceptively small unit since it is manned by the all the previous OYK specialty schools, the Underwater Demolition school, the Unconventional War Boat school, the Underwater Swimmer Delivery school, and the Underwater Demolition Base () respectively, effectively the rest of the DYK.