Via Purifico
The Via Purifico is a prison located in the lower sections of Bevelle. There is no way to revisit this area after the team has traveled through it.
The Via Purifico is composed of two sections: the prison section, which Yuna, Kimahri, Auron, and Lulu explore, and the underwater section, which Tidus, Wakka, and Rikku explore. Check out the walkthrough and strategy guide section for additional details:
23) Via Purifico
Walkthrough Guide
Helping Yuna locate each of her team members first and then guiding Tidus, Wakka, and Rikku through an escape from the underwater sections past Evrae Altana.