They lassoed it and brought he heavy object to the surface, where it was broken open with a small pickaxe.When Admiral Robertson returned to the bridge, he kneeled over Carlson""s body, when his throat was slit from behind with a machete(# 7 death).Injured by the fall, Laurie was also trappedinsidethe locked house while struggling to get away.The killer attempted to get through a locked door to attack her - finally using his fist to break down the wooden barrier and unlock it.[Note: The original San-Val Drive-In was in Burbank, CA, and was regarded as the second drive-in theatre in California.