. >> our producer was conducting an interview with lieutenant ben grundy while a second camera was shooting routine footage on the yard below. then suddenly -- >> there is an alarm in that building right there. >> our cameras search for signs that the trouble is spreading outside to the exercise yard. >> this is an actual alarm because nobody's waving us off yet. something is going on inside. >> what might be happening? >> probably an assault on someone coming out of their cell. some type of cell fight or maybe a slashing. >> officers subdued six inmates involved. one was slashed with a homemade weapon. fortunately, this incident was nothing like the deadly events of february 3, 2000. >> the day they had the big riot i was in this exact spot. >> on that rainy day joshua voss, a newcomer to pelican bay was down in the recreation yard with scores of other prisoners. many of them were wearing rain gear, not only as protection from the elements but to hide dozens of homemade weapons. >> i noticed over here some people started stabbing each other. >> this surveillance footage reveals a group of