separated by a common language - was Crithmum maritimum

Someone from England, I believe (message accidentally erased, so I cannot respond directly), replied to Deborah Lindsay' querry about cultural needs of Crithmum maritimum, with the advice that in England it is grown in tunnels to prevent the deer from feasting on it.  I confess that even after some consideration, I cannot figure out what growing in a tunnel would entail.  Images of mushroom caves, fenced off bunkers and entrances to subways (the underground/metro) come to mind, but I doubt the tunnel to which the writer was referring was anything like these.  Can anyone from the British Isles explain to this confused american what growing in a tunnel means?
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