CCC 1220
Christian Mystery›SECTION TWO THE SEVEN SACRAMENTS OF THE CHURCH›CHAPTER ONE THE SACRAMENTS OF CHRISTIAN INITIATION›II. Baptism in the Economy of Salvation
If water springing up from the earth symbolizes life, the water of the sea is a symbol of death and so can represent the mystery of the cross. By this symbolism Baptism signifies communion with Christ's death.