On 05/01/2018 09:17, RJH wrote:
snip

They did something similar in Barcelona when they had their Olympics
windfall IIRC. But not that deep - 30m?! Pretty much future proofs
infrastructure of this kind.

The private sector is not likely to take such a long-term view.

They had to go deep to get under stuff already there - eg the Channel
Tunnel Rail Link.

Of course it would have been cheaper to take the cables _over_ .....

--
Robin
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