Have you heard about JACOB'S WELL ?

@shivamani10 (11185)
Hyderabad, India
October 22, 2016 5:37am CST
This is an interesting natural area in Texas. This is one of the largest underwater caves. The well itself is an amazing part. It has got 10 chambers although there are many each going into another. The more you take a dive the deeper and narrower will be the tunnel. So far only 5 tunnels could be explored. This is a mysterious place and people are scared at it . The first chamber is about 15 meters deep and the sun rays can be experienced. The passage becomes more and more complicated after the 4th chamber itself. Many people have lost their lives exploring the caves.
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@MALUSE (44746)
• Uzbekistan
22 Oct 16
In the south of Germany is a cave system which is longer than 10 km. Up to now, 10 km have been explored but geologists know that it is much longer.