Cast away? The solution is in this image. The following video explains just the clues, then the theme is noted after that.

I wrote this over 3 years ago, and had hoped to get it in The Indy, but alas no. An unexpected announcement has caused me to fish it back from the editor’s pile, as it now needs a prompt release. I enjoy the podcast We Are History, but its demise has been announced, (podcasting is hard, I know) and the final episode is released today. Thanks for the fun, Angela (the bunker clue was just for you) and John.

Edit: Forgot to say that the title is a red herring, as the puzzle has nothing to do with this lot: