Traveling Through Blood Vessels
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Chaos looked into the distance. A massive amount of blood greeted his sight from left and right. These immense vessels of blood were the actual blood vessels of the Giant Frog!
Through using some sort of pore, Chaos and his party reached this ocean-like river of boiling and acidic blood capable of even melting metal with ease.
This immense river of blood led to the "outside" Chaos route which he had designed from the maps and info given to him by Froggo and all the survivors from the frog-kin race was that they could find a way outside through this pore that led to the blood vessels.
By traveling through these blood vessels straight and then reaching a certain area, they would find the outside by running through a stretching pore, pores where used for the amphibians to kept themselves moist through the excretion of slime, keeping their thin and soft skin always protected from diseases and other things like these.
FLAAAASH!