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If temperatures aren't like that, forget ice, but not broken-off blades. The bridge enclosure should be prety stiff to resist tons of material falling a hundred metres. With the enclosed bridge, you would have more or less the same safety, fire, and ventilation issues. (For the tunnel, it matters little if it is 5 or 100 km; as the two big Chunnel fires showed, what matters most for firefighter access and rescue is the direct vicinity of the fire, not the way there.)

As you say - cost is ultimately a Government decision, but I would see it as v. likely to be totally unaffordable for any Irish Government in the foreseeable future

There is the current budget crisis; but, you never know what governments are willing to waste money on. In the diary, I presented an example, the Koralmbahn: that little-justified project will cost the Austrian government €5.25 billion, while 3-4 other investments of a similar scale are on-going. (I estimate the Irish Sea Tunnel at €10-15 billion; for scale: the geologically much more difficult Gotthard Base Tunnel will cost around SFR9.7 billion = €6.5 billion). Another example: here in Hungary, the government maintained the big budget for highway construction even when public deficit exploded a few years back.

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Sat Dec 19th, 2009 at 02:31:34 PM EST
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