A mining engineer investigates the deaths of his fellow coworkers, discovering prehistoric nymphs and a creature capable of flying - and wrecking havoc - at supersonic speeds.A mining engineer investigates the deaths of his fellow coworkers, discovering prehistoric nymphs and a creature capable of flying - and wrecking havoc - at supersonic speeds.A mining engineer investigates the deaths of his fellow coworkers, discovering prehistoric nymphs and a creature capable of flying - and wrecking havoc - at supersonic speeds.