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They heat a tropical greenhouse and sturgeon farm with water from another tunnel: http://en.wikipedia.org/wiki/Tropenhaus_Frutigen

They weren't able to dump the water directly into the local river because it would disrupt the native trout, and so they cool it with the greenhouse and farm.

If I remember right the greenhouse and farm were businesses started by the engineers that were on the tunnel project.

The caviar is nice - not as much minerality as normal, but still good texture and taste.



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