i buy a lot of cheap movie and none of them be usually any good but this one surprise me . it be obvious that it have a low budget and the overall film make isn not very good but the idea behind the story capture my interest . the thought of undiscovered cave deep within the earth contain life really excite me . if only this movie could be remake and alter a little on a much large scale and it could be one of my favourite . this film be let down however by a low budget . the set wasn not bad but the costume be terrible . the design of the caveman look quite good and the dark eye and pale skin and increase hearing be what you might imagine from a specie who have evolve in a dark cave but i do not like those hairstyle ( that the 80 for you ) . the acting be poor and some of the character be pointless . the opening scene introduce two of the main character well but other then that it should have be explain what have be go on exactly . every now and then i be inspire by a story and want to write something myself along the same line and this have one of those inspire story . i highly recommend watch this if you do not mind b movie .