(historical fulfillment) of the salvation that comes to us in Christ.
In 1 Peter 3:20,
Peter states, “When God’s patience waited in the days of Noah, while
the ark was being prepared, in which a few, that is, eight persons, were
brought safely through water.”
Peter makes the point that Noah and his
family (eight people) were saved from the destructive waters of the
flood in the ark. The water that destroyed the world in Noah’s day and through which Noah is saved “corresponds” (antitypon) to baptism for Christian believers (1 Peter 3:21; cf. Romans 6:4).
Noah and his family’s salvation in the ark points to the salvation that has come in Jesus. Jesus is the “ark” of salvation, the one in whom we must trust to be saved from the judgment of God (John 10:9).
The destruction of the earth through a global flood was a type of the
final judgment that will come by fire on the last day when God judges the world but at the same time rescues the godly because they have been saved through Jesus Christ (2 Peter 2:9, 3:7)." AIG