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I'm sure there must be some people there.

I don't think we have any currently active members in Nova Scotia. Csonni, who hasn't been around much lately lives in Labrador, but that's only about 400 km closer than I am in Toronto (1700 km from Halifax).
jb lives in Montreal - still 1200 kms away from Halifax. Chris Kleeman in NH is actually closer than that by about 200 km.
'Tis a big country!! (Canada - or the US for that matter!)
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Need a bolt hole for emergencies
Then, we can assume she is bringing plenty of 'bolts?'
OTOH, you must be referring to the British slang term (and who said it was nearly obsolete?!)
Sounds like a perfectly suitable term, considering its WW1 origins: A hole dug into the side of a trench in which one can 'bolt' to avoid 'incoming!'
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I think it's also a fox-hunting term as well.
Yes, the 'hole' seems to be anywhere needed, even if it's actually a 'harbor!' It's simply a 'safe' place. I'm sure most fox and rabbits keep one close at all times! And, once I confirmed its meaning, it was perfectly logical and clear, even self-explanatory! Maybe my trouble was that I had just been looking for a replacement bolt and nut...I already had the hole...
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No its not obsolete. Say it at least every day
That's good enough for me!
Still, I read at least one text that called, the 'bolt-hole' version, obsolete. Maybe that 'author' lives in London!
Must say, I've never heard it at all, 'over here.' But this is a pretty large country... Maybe in the NorthEast or along the Mid-East coast (Virginia, North & South Carolina) where there is still a very big british language influence.