Spelunkers exploring Racer Cave in Gunung Mulu National Park (Borneo)
This is a small cave that Mulu Park guides use to evaluate if people can be taken in deeper caves that have more technical difficulties, like "Clearwater Connection". 3 people in our group of 8 didn't pass the "Racer Cave" test.
For more photos and information about this natural cave, go to my Racer Cave photo series.