"Cave tubing" refers to a recreational activity where people float on inflatable tubes through underground caves or tunnels, typically found in locations with underground rivers or water systems. Full definition
The water is murky and water level is a little higher than normal but is open for cave tubing. (belizeinlandtours.com)
Need we add the ultimate kid - driven activity of cave tubing? (chabilmarvillas.com)
After zip lining we got a chance to take it easy by cave tubing in the dark mysterious cave, where we saw and learned a lot about limestone formations. (splashbelize.com)