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* The 1952 FilmSerial ''Film/ZombiesOfTheStratosphere'' has the Martian hideout accessed via a hidden trapdoor ladder in a flooded mine shaft, which they can access due to their superior Martian swimming skills. The hero Larry Martin is nearly killed on several occasions when he goes snooping around there, but instead of calling in a squad of Navy UDT's to do a proper search, he waits until the final chapter when Creator/LeonardNimoy's character finally tells him how to get inside.
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* ''Literature/TheMagiciansNephew'': A rare above-ground example. The plot begins with the children exploring a tunnel which goes through the attics of several houses, and they enter what they believe is an empty house, but is in fact Uncle Andrew's attic study.
