exporting tubes from aven

[Graham Mullan]

 > +++ Erin Lynch [2012-11-25 05:13 -0800]:
 >>
 >> Hi Wookey,
 >
 >> Is there a version of survex (or a script) which will output the
 >> passage walls in a vector format (dxf, svg, shp, ...)?

Had exactly the same query two days ago from someone who wants to import 
the data into CAD. Have sent him example Therion data exported as dxf 
and esr. When (if!) he responds, I'll post again.

Graham