The Grand Arena / Split and follow Bonny(3)
From Create Your Own Story
The Grand Arena
Deciding to split up, you take the right path as Bonny. You give Laura and Rikku luck then dive under after you watch them float on further down their current to the left. It is dark, but being around water your whole life you manage to swim forward, finding your way through a hole. You go for a little while before suddenly you see light, instantly swimming towards it. But then you swim smack into a grate blocking you off from the path. Looking through it, you can see that the water comes up into a pool somewhere else in the temple. Could it be where you want to be?
But you realize you might not have enough time to get the grate off before you run out of air. You can see that there is a little light off to your left, a small pocket of air down another tunnel of rock. You could play it safe and go over there, though it looks a little dangerous.