mexican government showing mexican marines storming the secret hideout of narco kingpin joaquin el chapo guzman. the gun battle erupted befe dawn friday in el chapo'o'some state of sin sineloa. an elite commando unit busting into a safe house, weapons drawn, seen here in body camera footage. under heavy .50-caliber fire, the first marine through shot in the arm. another marine pulling thein on a grenade, tossing it inside. the explosion shakes the house. >> this is where the initial gun battle happened. how many bulle holes pierced this door. and of course that window. and inside obviously evidence of this massive gun battle here. blood on the floor there. this disaster of a kitchen. bullet holes everywhere. a number of bullet holes up these stairs is mind boggling. ferocious of the fighting took place. look at this. about the as marines went up the stairs, el chapo was heading down through this mirrored wall designed for this exact moment. >> and right through here is this trap dooror. this is the secret passageway and doorway that leads to the tunnel down there. it's incredible that right out