Entrance to Puerto Princesa Subterranean River.
Beach outside the cave entrance.
Trying to navigate (eventually gave up).
It got muddy.
Lots of mud.
Dr. Jud Partin.
Jud in mud.
Jud and Bayani in water.
Jud measuring drip rates and collecting water.
Jud collecting drip water.
Bayani measuring drip rate.
Jud sealing the water samples and doing some more "sampling".
Bayani in water.
Jud and Bayani contemplating where to sample.
Accomodations aren't bad.
Contemplating the days field activities over breakfast.
Jud on his n-th cup of instant coffee.
Park rangers Aying (front) and Ardes (middle), and Rap Rios (caver/photographer who shot the nice pictures that you just saw).