the simplest meaning is that because the Ark floated on the water, he was saved by water.
Psalm 29:10 The Lord sitteth upon the flood; yea, the Lord sitteth King for ever.
Are we saved by death or by Life? 1 Timothy 3:16 And without controversy great is the mystery of godliness: God was manifest in the flesh,
justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.
If death saves rather than condemns then as “all” were made dead by His body.
...is death what saves or condemns? ...justified of God in the Spirit? : 1 Peter 2:24 Who his own self bare our sins in his own body on the tree, that we,
being dead to sins, should live unto righteousness: by whose stripes ye were healed.
2 Corinthians 5:14-15 For the love of Christ constraineth us; because we thus judge,
that if one died for all, then were all dead: [15] And
that he died for all, that they which live should not henceforth live unto themselves, but unto him which died for them, and rose again.
Romans 6:2-12 God forbid. How shall we,
that are dead to sin,
live any longer therein? [3] Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death? [4] Therefore we are
buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so
we also should walk in newness of life. [5] For if we
have been planted together in the likeness of his death,
we shall be also in the likeness of his resurrection: [6] Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin. [7] For he that is dead is freed from sin. [8] Now if we be dead with Christ, we believe that we shall also live with him: [9] Knowing that Christ being raised from the dead dieth no more; death hath no more dominion over him. [10] For in that he died, he died unto sin once: but
in that he liveth, he liveth unto God. [11] Likewise reckon ye also yourselves to be dead indeed unto sin, but
alive unto God through Jesus Christ our Lord. [12] Let not sin therefore reign in your mortal body, that ye should obey it in the lusts thereof.
2 Corinthians 4:10-11 Always bearing about in
the body the dying of the Lord Jesus, that
the life also of Jesus might be made manifest in our body. [11] For we
which live are alway delivered unto death for Jesus' sake,
that the life also of Jesus might be made manifest in our mortal flesh.
“walk in newness of life” is coming forth out of the tomb (coffin) stepping out in obedience unto new life, is it not? Out of darkness into light. it is those denying the Resurrection power thereof that remain dead and in darkness. “For in that he died, he died unto sin once: but
in that he liveth, he liveth unto God.” ...in that he liveth, he liveth unto God. As do the children of God...