The survey data have been uploaded to the SELAS website here: Voronya survey data. There was a delay caused by having to go in and manually correct many of the LRUD measurements which did not convert smoothly.
The data are available for download in both .dat format for Compass and .tro format for Visual Topo. Despite the site being almost exclusively in Greek, following the link, you should be able to click on the right file: Voronia - Krubera (tro) or Voronia - Krubera (dat), without needing to read the Greek text.
A .wpt file with the GPS coordinates of the entrance is also available for download in the same place.