The Nemesis Of Fire (1974) by Algernon Blackwood, starring Malcolm Hayes as Dr. John Silence

[@MartinJackson-tb6xc]

Great stuff, liked the colonel sounding a bit like a drunk Donald Sinden

[@annrogers8129]

You live and learn, or you don’t live long! ( Note books of Lazarus Long. Time enough for Love by Robert A Heinlen. )

[@jwsuicides8095]

Spoiler alert:
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It was going so well until the end. What was she doing? Why was it easier to build a tunnel rather than carry the body out? Maybe I just got too confused.