The caves BC4 and Mala Boka - Canin massive - Slovenia - were connected.The overall denivelation of this travers is 1280 m!!!
The cave BC4 was connected with system Mala Boka in parts named Millenium Galleries, in the highest parts of the system.System BC4 was explored three years by Polish cavers, they made there 90 % of work. The connection itself was made by Italians!
Martin From Cavediggers yahoogroups