A story of  the origin  of sand in the unique  wine cellars in  New Saldorf was  broadcasted  in one  of the tv sessions in  channel CT 2, called Folklorika, on 29 September 2018 . According to the legend, the sand was collected and sent off to Vienna, where it was used to build houses. AdMaS researchers from RG1 surveyed this sand at the request of local winemakers and spoke in the program about their research.
The whole story can be viewed at:

https://www.ceskatelevize.cz/ivysilani/1102732990-folklorika/318291310040007-pisek-pro-viden