Also, on the whole water flows thing, I don't think that there is any requirement for water flows, if I understand Gloranthan tides correctly. Does not all the seas go up and down at the exact same time, as the blue moon rises and plummets? So it is clearly not a case of volumes of water moving from one place to another, rather in Glorantha water is mystically compressible.
I think the importance of the 'tunnel' is therefore symbolic/magical/mythical: It connects the White Sea to the rest of the oceans, therefore it is part of that same whole of 'the seas' and therefore is affected like them.
Which also means it should have been affected by the closing? I wonder if that did anything to ice floes?
-Bryan
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