Throughout the Bible, Scripture clearly teaches that Hell is in the belly of the earth. Science has even proven that below the earth's crust lie vast chasms and hollows (created by plate movement and underground volcanic action) in which gases, extreme heat, and fire exist. This fits the exact description of Hell as given in the Bible:
Matthew 11:23 - "Hades" - Strong's Concordance #86
(NIV) - "you will go down to [the depths]"
(KJV) - "shalt be brought down to [Hell]"
(NLT) - "you will be brought down to [the place of the dead]"
Luke 16:23 - "Hades" - Strong's Concordance #86
(NIV) - "In [Hell], where he was in torment, he looked up..."
(KJV) - "And in [Hell] he lift up his eyes, being in torments,"
(NLT) - "And his soul went to [the place of the dead],"
II Peter 2:4 - "Tartaros" - Strong's Concordance #5020
(NIV) - "but sent them to [Hell], putting them in gloomy dungeons to be held for judgment;"
(KJV) - "but cast them down into [Hell],"
(NLT) - "He threw them into [Hell], in gloomy caves and darkness until judgment day"
Amos 9:2 - "Sheol" - Strong's Concordance #7585
(NIV) - "Though they dig down to the depths of [the grave],"
(KJV) - "Though they dig into [Hell],"
(NLT) - "Even if they dig down to [the place of the dead], I will reach down and pull them up."
Numbers 16:31-33 - "Sheol" - Strong's Concordance #7585
(NIV) - "the ground under them split apart and the earth opened its mouth and swallowed them, ...They went down alive into [the grave],"
(KJV) - "the ground clave asunder that was under them. And the earth opened her mouth, and swallowed them up, ...They, ...went down alive into the [pit],"
(NLT) - "the ground suddenly split open beneath them. The earth opened up and swallowed the men, ...So they went down alive into [the grave],"
For your information:
God doesn't send anyone to hell. It was created for the devil and his demons. We send ourselves to hell when we refuse His gracious offer of salvation through eternal life: John 3:16 - "For God so loved the world that He gave His only begotten Son, that whosoever believes in Him should not perish but have everlasting life!"
The bottom line is - Those who do not accept Jesus as their Personal Lord and Savior will end up in hell:
"Then He will also say to those on the left hand, 'Depart from Me, you cursed into the everlasting fire prepared for the devil and his angels (Matthew 25:41).
"The Son of Man will send out His angels, and they will gather out of His kingdom all things that offend, and those who practice lawlessness, and will cast them into the furnace of fire. There will be wailing and gnashing of teeth (Matthew 13:41-42).
...unless you repent you will all likewise perish (Luke 13:3).