This is presumably why God designed the mode of baptism to portray a burial. It represents the death that we experience when we are united to Christ. So know, believer, that you have died. This is what your baptism meant and means. Baptism portrays our newness of life in Christ.
Nobody stays under the water of baptism.
We come up out of the water. After death comes new life. And this happens through faith in the working of God who raised Jesus from the dead. We believe that Christ is alive from the grave and reigning today at the Father's right hand in heaven from which he will come again in power and glory. In fact, the newness of life is the life of faith in the glory and the working of God.