Nothing quite so macabre. There is a company that does pre fab. Dig a big hole, plonk in it. Bob's your uncle and Fanny's your aunt.
http://www.colinfurze.com/bunker.html
What's the correlation between building your own bunker and owning a tandem? I get that not every tandem owner has a bunker, but if you decide to spend lots of money to live like a naked mole-rat, surely n+1 can never be an issue with your SO?
@PhilDAS started
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Nothing quite so macabre. There is a company that does pre fab. Dig a big hole, plonk in it. Bob's your uncle and Fanny's your aunt.