But two crevice systems are found in the cave: one 20-200° followed by the stream angled gently to the northwest, and one 140-320° nearly vertical.

[2]: 30 The cave was explored on 5 March 1973 when the layer of soil and stones was removed,[2]: 30  and continued on 11 March by the Speleološki klub "Željezničar", mapped by Marijan Čepelak,[3]: 4  and again but with a 3D point cloud by a team from the Faculty of Science at the University of Zagreb in 2019–2020.

[3]: 9 In order to combat hypothermia, wooden planks were used during the exploration of the stream, marking the first use of that technique in Yugoslavia.

[3]: 34 The maximum radon concentration is about 4000 Bq/m3 and likely even higher in the summer, thanks to due to poor ventilation.

[9][3]: 34 Velebitaška jama formed in Upper Tortonian layers of organogenic and bioclastic limestone, sandstone, and lime and clay marlstone.