God sent Jonah there for 3 days and night, he even sent Jesus there for the same time. The ones He sends to hell are there because they believed a lie that was a prophecy, the ones sent there are destined to be there. Like the people alive, their eyes are open. What they witness is what fallen angels do on their last day of life.
Isa:14:9-16:
Hell from beneath is moved for thee to meet thee at thy coming:
it stirreth up the dead for thee,
even all the chief ones of the earth;
it hath raised up from their thrones all the kings of the nations.
All they shall speak and say unto thee,
Art thou also become weak as we?
art thou become like unto us?
Thy pomp is brought down to the grave,
and the noise of thy viols:
the worm is spread under thee,
and the worms cover thee.
How art thou fallen from heaven,
O Lucifer,
son of the morning!
how art thou cut down to the ground,
which didst weaken the nations!
For thou hast said in thine heart,
I will ascend into heaven,
I will exalt my throne above the stars of God:
I will sit also upon the mount of the congregation,
in the sides of the north:
I will ascend above the heights of the clouds;
I will be like the most High.
Yet thou shalt be brought down to hell,
to the sides of the pit.
They that see thee shall narrowly look upon thee,
and consider thee,
saying,
Is this the man that made the earth to tremble,
that did shake kingdoms;
Re:19:21:
And the remnant were slain with the sword of him that sat upon the horse,
which sword proceeded out of his mouth:
and all the fowls were filled with their flesh.
Isa:65:12-16:
Therefore will I number you to the sword,
and ye shall all bow down to the slaughter:
because when I called,
ye did not answer;
when I spake,
ye did not hear;
but did evil before mine eyes,
and did choose that wherein I delighted not.
Therefore thus saith the Lord GOD,
Behold,
my servants shall eat,
but ye shall be hungry:
behold,
my servants shall drink,
but ye shall be thirsty:
behold,
my servants shall rejoice,
but ye shall be ashamed:
Behold,
my servants shall sing for joy of heart,
but ye shall cry for sorrow of heart,
and shall howl for vexation of spirit.
And ye shall leave your name for a curse unto my chosen:
for the Lord GOD shall slay thee,
and call his servants by another name:
That he who blesseth himself in the earth shall bless himself in the God of truth;
and he that sweareth in the earth shall swear by the God of truth;
because the former troubles are forgotten,
and because they are hid from mine eyes.
The ones sent to hell is the 2nd group in Re:7 as hell is known as 'great tribulation' in Scripture. They appear to be saved in those verses.