Dr Who episode(s) with faces in a cave/tunnel wall

Hi there, another one which has been bugging me for years. A Dr Who story/episode (I think it’s Tom Baker with Leila but not sure) where there are some scary faces in a mud wall (they were scary when I was 7/8 :slight_smile: ) in a tunnel or something…

Just a guess, there are murals on the wall, subway in this one:

Two guesses:

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