When you reach the fork, you're forced to take the left path as the forward one is blocked.
At the water, Tidus, Wakka, and Rikku will swim to the other side.
Once there, you'll have to do the first trial which involves Wakka hitting the center of a target blocked by a rotating shield.
After completing the trial, get the Lv. 1 Key Sphere from the chest that appears in front of you.
Return to the first fork.
The forward path will now be open.
You'll come to another fork.
Take the right path to reach another underwater area.
At the end of this path, you'll have to do the second trial - send Rikku to the Green,
send Tidus to the Blue, and send Wakka to the Red.
Afterward, get the Fortune Sphere from the chest that appears.
Return to the previous fork and take the right path.
After a short underwater passage, you'll find 2 chests with a Return Sphere and a Recovery Ring.
Go back to the first fork again and take the left path once more.
This time on the right side, you'll be able to enter the alcove and get the Pep Talk there.
Return to the second fork and go left.
On the left side there will be a series of step-like rocks now that will take you upwards.
Just as you reach the end of the cave, you'll be attacked by the Sanctuary Keeper.
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