Caving in the Czech Republic

Heading off for a conference in the Czech Republic in June and have got a few days off in the middle. Anyone know any good caves? or have any contacts in the area I could go with? I'll be around Brno.

Thought I might as well make the most of a free trip.

There's a caving club in Brno, try contacting them, http://speleo.marvec.org/, or there's a club in the Moravsky Kras(area near Blansko, with quite a few caves) http://6-20.speleo.cz/index.htm , (and http://www.speleo.cz/index.php?lang=cz&section=css&text=zocko&zoid=6-12 ).

When I was in Dresden I caved just across the German border in the Czech republic.  I've actually been down the longest sandstone cave in central Europe!