which is usually submerged in the ocean and he also calculated that the island sinks once every 70 years. However, the sea water appearing from the ground is the evidence that Hank sees that leads him to prove that the calculations are wrong, and that the island will sink in a couple of days. Their only means of salvation seems to be the legendary Nautilus (Captain Nemo's submarine), hidden somewhere on the island. Kailani enters Nemo's crypt and finds his journal, which has the whereabouts of the ship in a cave at Poseidon's Cliffs. They decided to go to that cave through the heart of the island.