There are some photos of first diving (and more works of VDT) in Bull Rock Cave: http://www.byciskala.cz/MaRS/index.php? ... &celkem=36
But text is only in czech language. (VDT GfH - Verein deutscher Touristen, Gruppe für Höhlenforschung)
Please do you know more info about "Standard equipment" diving?
Ing. Günther Nouackh have diving suit made by Westfalia. Using closed circle with absorber of CO2. Unfortunately, the suit is missing now. And information about VDT work are only sporadic.
(sorry for my english:-))