From the Able Archer thread - unrecovered nukes.

[StainlessSteelCynic]

You know, I don't think the peat bogs are as much of a concern as say storage tunnels (e.g. from quarries and mines). Peat bogs in Siberia would see very little traffic but those old mines had some decent tracks and roads leading to them and it seems they don't really bother to guard them anymore considering what we've seen coming from urban explorers.