I drilled hole in ice above steel structure that I found with SI in summer, and made scannings in four directions from it:
http://img51.imageshack.us/img51/663/o8z0.jpg
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http://img199.imageshack.us/img199/2431/j0l.PNG
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http://img600.imageshack.us/img600/2903/d517.png
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http://img31.imageshack.us/img31/6043/2a0.PNG
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http://img607.imageshack.us/img607/2483/k09n.png
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Unfortunately there is no ice above bigger structures at deeper water yet. May be they will be more fish attractive.

