I agree with those who believe hell was divided into two segments, one of torment, one called paradise until after the Lord ascended and offered his blood to anoint the mercy seat. Only afterward could saints go directly to heaven.
We have two examples of OT saints being in the earth.
First, Samuel.
1 Sam 28:11 Then said the woman, Whom shall I bring up unto thee? And he said, Bring me up Samuel.
12 And when the woman saw Samuel, she cried with a loud voice: and the woman spake to Saul, saying, Why hast thou deceived me? for thou art Saul.
13 And the king said unto her, Be not afraid: for what sawest thou? And the woman said unto Saul, I saw gods ascending out of the earth.
14 And he said unto her, What form is he of? And she said, An old man cometh up; and he is covered with a mantle. And Saul perceived that it was Samuel, and he stooped with his face to the ground, and bowed himself.
15 And Samuel said to Saul, Why hast thou disquieted me, to bring me up? And Saul answered, I am sore distressed; for the Philistines make war against me, and God is departed from me, and answereth me no more, neither by prophets, nor by dreams: therefore I have called thee, that thou mayest make known unto me what I shall do.
It is clear here that Samuel was brought up out of the earth. So he was not in heaven.
And we have Lazarus in Luke 16.
Luke 16:22 And it came to pass, that the beggar died, and was carried by the angels into Abraham's bosom: the rich man also died, and was buried;
23 And in hell he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom.
24 And he cried and said, Father Abraham, have mercy on me, and send Lazarus, that he may dip the tip of his finger in water, and cool my tongue; for I am tormented in this flame.
25 But Abraham said, Son, remember that thou in thy lifetime receivedst thy good things, and likewise Lazarus evil things: but now he is comforted, and thou art tormented.
26 And beside all this, between us and you there is a great gulf fixed: so that they which would pass from hence to you cannot; neither can they pass to us, that would come from thence.
27 Then he said, I pray thee therefore, father, that thou wouldest send him to my father's house:
28 For I have five brethren; that he may testify unto them, lest they also come into this place of torment.
29 Abraham saith unto him, They have Moses and the prophets; let them hear them.
30 And he said, Nay, father Abraham: but if one went unto them from the dead, they will repent.
31 And he said unto him, If they hear not Moses and the prophets, neither will they be persuaded, though one rose from the dead.
Note it says Lazarus was carried "into" Abraham's bosom. And though these two sections were seperated by a great gulf, they could see each other. And notice in verse 31 it says "rose" from the dead.
I believe Jesus soul and spirit went down into this paradise section of hell. After he rose from the dead he offered his blood at the mercy seat. Sometime after that I believe he brought the saved dead out of the earth and took them to heaven.
I have read one article that says John 14 speaks of Jesus offering his blood on the mercy seat as making it possible for dead saints to ascend to heaven.
John 14:1 Let not your heart be troubled: ye believe in God, believe also in me.
2 In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
3 And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
Heaven is already created, and Jesus says that the mansions are already there. But he had to offer his blood on the mercy seat in order for dead saints to ascend to heaven and take possession of these mansions. And notice Jesus said he had to go and prepare a place for us, then he must return and receive you unto himself.
And we also have John 3:13
John 3:13 And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.
Now, according to Jesus, at the time he spoke to Nicodemus no man had yet ascended to heaven.