"We can say that, possibly, Jesus died by direct asphyxia from muscular exhaustion, and by indirect asphyxia, secondary to cardiac insufficiency. This insufficiency could have caused acute pulmonary edema. Pleural and pericardial edema (accumulation of aqueous fluid in the thoracic cavity), explains the outflow of water after the centurion withdrew the spear."

"The amniotic sac, contains mainly water, necessary for the life of the fetus; and the umbilical cord is vital in the exchange of nutritive substances and oxygen-rich blood." (Google)

Similarly, the accumulation of water and blood in the thoracic cavity of the Lord Jesus Christ, had as its main purpose, to give salvation and eternal life to those who believe in Him.

John 19:34-35 NKJV

34 But one of the soldiers pierced His side with a spear, and immediately blood and water came out. 35 And he who has seen has testified, and his testimony is true; and he knows that he is telling the truth, so that you may believe.

John 3:5-6 NKJV

5 Jesus answered, “Most assuredly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God. 6 That which is born of the flesh is flesh, and that which is born of the Spirit is spirit.

1 John 1:7 NKJV

7 But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus Christ His Son cleanses us from all sin.

Mark 16:15-16 NKJV

15 And He said to them, “Go into all the world and preach the gospel to every creature. 16 He who believes and is baptized will be saved; but he who does not believe will be condemned.