On Kauai you have the opportunity to visit both wet and dry caves.
The dry cave, Manini-holo Dry, sits among a grotto of ferns just across
from Haena Beach Park on Highway 56. This cave feels deep and dry
here. The cave is about 300 yards deep. It was much larger but the
tsunami of 1957 filled part of it with sand.
Legend has it that Manini-holo, the Menehune (little people) who
where chief fishermen dug the cave in search of the supernatural beast,
akua, who had been stealing their fish. In reality, the ocean used to
be much higher than it is now and the caves were formed when the ocean
waves beat against the lava and etched away the rock.
When you visit the cave be sure to bring a flashlight to see the intricate designs that are etched on the caves sidewalls.
Waikapala'e Wet Cave is located just down the road. This cave has
an unusual effect for you if you want to brave the ice-cold water to
the Blue Room. You will need to swim through a small opening at the
back of the main cave to the smaller room where you will want to look
toward the main opening. The sunlight reflecting off the freshwater
makes everything around you turn blue!
The water in the wet caves comes from underground springs that
eventually feed into the ocean. The water level in the caves are
effected by the tide. Viewing in the Blue Room is best during high tide
as the sunlight has a narrower opening into the chamber and more of the
blue color is reflected.
Some things to keep in mind, there is a short hike to the cave and
bacteria, such as leptospirosis is often present. You will see a sign
posted nearby that states the hazard and states "No Swimming." But, if
you are going to go anyway be aware that the water is very cold and in
the Blue Room there is NOTHING to hold onto so you will have to tread
water the entire time you are there. You will want to wear reef shoes
to provide grip on the slippery lava rock. (NOTE: Several people have drowned in the caves so be VERY CAREFUL or don't even attempt to go into the wet caves)
http://www.hawaiibeautiful.com/kauai/wet-and-dry-caves-kauai-hawaii.html
