due to the fact that in 1976 there be no cgi i felt that the movie be quite watchable . the studio production be very good and very elaborate . the background effect be very believable and always appear a if they be part of the whole set . the actor do ok consider the premise of the film be set in a type of jules vern atmosphere where imagination and possibility of future exploration be at most improbability . have i watch this film in 1976 i probably would have be in awe of the ability of man to build a machine that could travel to the earth core . i still wonder to this day why we be not all fly around in our car but i digress . mcclure and cushing have their funny moment and mostly from their facial expression toward each other which of course make the film somewhat campy which i love . the amonsters leave something to be desire but the story have a good premise although i feel a though some other sort of thing could have be more believable under those circumstance . all in all quite watchable for it time and fun now .