This tour is private tour to Underground river provided with private AC transportation and motorized boat transfers. The Puerto Princesa Subterranean River National Park or popularly known as the Underground River is the the world's longest navigable underground river and one of the New Seven Wonders of Nature. Guests will enjoy seeing various limestone formations which were formed thousands or even millions of years ago. Truly, this makes Underground River the number 1 tourist attraction in the city. Important Notes: 1. Underground River tour permits are limited to a maximum of 1000 slots per day and should be booked ahead of time. Ideally a month before arrival. Minimum time for me to process the permits is atleast 3 days before arrival. This tour is subject to weather conditions. 2. Tour inside the cave is always on group of 8-10 persons per boat as strict policy of the park due to operational limitations of the site. 3. Tour is on first come first serve basis at the site.