There are thousands of caves deeper than 100 m, hundreds of caves deeper than 1000 m and singles deeper than 1500 m in the world. It is a dream of every caver just to be in a cave deeper more than 1000 m, and of course take part in its exploration. It is a problem to approach such cave, but more difficult problem is to find an equipped group with enough physical and psychological train for such an action.
of caves deeper than 1000 m has many physical problems, such as hard rope
work in the shafts, searching entrances in obstructions, danger of floods,
heavy equipment, etc. In addition, in that kind of expedition everyone
needs to know how to live in small group during long period of at least
15 days, in limited spaces with low temperature and high humidity, in
shortage of food, light and energy resources.
So only some groups in the world take part in exploration of the deepest caves and every additional meter needs hard work, excellent expedition organization and sometimes just fortune.
ten deepest caves in the world are: