Cavers from the cave research unit of the Hebrew University of Jerusalem have just returned from exploring Krubera-Voronya in Russia – the deepest cave in the world. They broke records for the deepest that an Israeli has ever reached, plus the longest an Israeli has spent underground. (Not sure if Rabbi Shimon bar Yochai would have disputed the latter!)
http://www.timesofisrael.com/israeli-explorers-take-part-in-world-record-breaking-expedition/