Build a movie plot around this: Where did Waxman and Mengers arrive to intercept Grogan and Maggie? Maggie and Paul's camp.
The answer to this question is:
David (Roger Richman) and Barbara (Janie Squire) are two young backpackers who happen upon a military post that seems to be abandoned. They discover a large man-made reservoir and decide to go skinny dipping. Within minutes they are attacked and consumed by some underwater presence, their death screams attracting the attention of somebody still inside the military facility.Maggie (Heather Menzies) is an investigator hired by Barbara's parents to find their daughter and her companion. With financing from her employer Earl (Richard Deacon), Maggie travels to the mountainous area where the two were last seen, and she seeks out the cabin of Paul Grogan (Bradford Dillman). Paul is a backwoods type who lives in a log cabin with his young daughter, who is away at summer camp. Maggie convinces him to take her to the military facility, and they discover the pond. Paul notices that the water is salty. Exploring the buildings of the complex, they find a laboratory with numerous strange animals, including a bizarre, lizard-like creation. Maggie decides that it's possible that David and Barbara drowned in the pond, and she takes the initiative to drain the pond to find out. She flips the switch, and suddenly they are confronted by a white-haired man (Kevin McCarthy) who lurches at them in a panic, trying to shut off the drain switch. In the melee, he is knocked unconscious.Paul and Maggie go outside to the empty pond and find the bones of David and Barbara caught in the drain. When the mysterious man attempts to steal Maggie's jeep, he crashes it and injurs himself even more. Taking him down to Paul's cabin for the night, the man rables on about 'razorteeth' and that they are all in danger.The next morning, Paul and Maggie load the man onto Paul's homemade log raft and they set out downstream to take him to town. When he awakens, he reveals that he is Dr. Hoak, and he explains that Paul and Maggie have done something terrible. The pond contained a breed of mutant piranha, which Hoak had been developing for use in the...