despite it budget limitation and this be a great film and proof that effort and imagination can overcome lack of cash . the opening and in which cave painting seem to show how some dinosaur at least survive into the age of human being and be a nice red herring . after that and a meteor come down into a lake and cause heat which and in turn and cause the hatching of a frozen dinosaur egg ( maybe the cave painting suggest instead that this isn not the first time such a thing have happen ) . when the prehistoric beast appear and it a well animate plesiosaur which be soon cause disappearance in the local area . alright and so it not jurassic park and but it still genuine entertainment for fan of monster movie .