In reply to mullermn:
I remember that tragedy happening.
I hadn't realised that two shelters/bothies involved were subsequently demolished on the basis that if a shelter is known to be on a mountain for use in an emergency it tempts people to press on in conditions where they really should turn back. If it's not there, then a party will turn back rather than try and probably fail to find it in a white out.
It's an interesting hypothesis, but is it right? I wonder if emergency shelters save more lives than those which are lost through people failing to find them?
There is also the problem that if people know of the existence of an emergency shelter and it gets removed, not everyone will know that, and it's likely that those who haven't heard of it's removal will be at potential risk.
Remember the big controversy when Jean's Hut was demolished? There were still people I met decades afterwards who were unaware that it had gone.