Trivia: When the trailer for The Time Machine was first shown, Alexander is looking at a futuristic city. When the movie was officially played in theaters, the scene was changed to a red sky with Morlock lairs everywhere. Originally, the futuristic city was to show that the Morlocks had been defeated and that the Eloi evolved. It was changed because Simon Wells felt that if the Eloi won and evolved, Alex would have no reason to go back and start a new life with Mara.
Trivia: At the end of the movie, when Mrs. Watchitt is standing in the doorway, there is a picture of H.G. Wells hanging on the wall behind her.
Trivia: The director of the movie, Simon Wells, is the great grandson of H.G. Wells.
Trivia: Lovers of the 1960 version of the movie will know that Alan Young, who made a brief appearance as the flower store owner in this film, portrayed both David Filby and his son James in the original.
Answer: He's referring to the sound that the Morlocks' machinery makes from underground.
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