>It's an investment that if done right could outlast any above ground home. I would think this was true, but what I've learned so far suggests it's not... Und

>It's an investment that if done right could outlast any above ground home. I would think this was true, but what I've learned so far suggests it's not... Underground, you're not finding refuge from harmful forces on your structure; they exists there too. Things shift, things crack, things leak, humidity causes problems, the whole exterior now endures a chemical interface with the surroundings (and all your Vault-Tec steel will corrode at some speed determined by the nature of the local media). If you're lucky enough to have near-surface bedrock where you are, digging into that is probably your best bet, but, even then, it seems like an uphill battle.