BRATISLAVA April 8 (SITA) - The expedition of Slovak cavemen to two Venezuelian mesas Kukenan and Roraima in March brought very valuable discoveries. Slovak expeditors found in the massifs of Roraima the continuation of passages of the cave system Cueva Ojos which were unknown up to the present day. This system became the longest quartzite cave in the world with a length of 15 280 meters. The forth expedition of Slovaks to Venezuela lasted 23 days. The 6-men exploratory team was led by Branislav Smida from the Speleoclub of the Comenius University in Bratislava. Apart from four members of The Slovak Speleological Association documentary filmmaker Pavol Barabas participated on the expedition.