Sonja and Marko Vogrič in a small inflatable boat at the beginning of the passage in Lake II. of Križna jama cave, Slovenia.
Tomaž Planina
CC BY-SA 4.0
<a rel="nofollow" class="external free" href="https://www.dzrjl.si/publikacije/vikipedija/">https://www.dzrjl.si/publikacije/vikipedija/</a>