Here Jesus plainly states that the unrighteous will be punished by being put into "hell," which He describes as a fire that will not be quenched. In this scripture, the word "hell" in the Greek is (geenna) Spoken as (gheh'-en-nah)

This word means "Valley of Hinnom," a valley on the south side of Jerusalem where refuse was continually burned.

Jesus used this area as a type of the place where the wicked will receive their final punishment.  

The Bible describes the "hellfire" into which the wicked will be cast as a lake of burning fire and brimstone.

Some have pictured this Lake of Fire to be like an active volcano spewing out molten rock.

Into such a fiery liquid the incorrigible will be thrown.

After having died once and been resurrected to judgment (Hebrew 9: 27 Just as man is destined to die once, and after that to face judgment,), they will die the "second death" by being burned up in the Lake of Fire.

"Surely the day is coming; it will burn like a furnace. All the arrogant and every evildoer will be stubble, and that day that is coming will set them on fire," says the LORD Almighty. "Not a root or a branch will be left to them.

The ultimate fate of the wicked will be total annihilation.

Body, mind and spirit will be destroyed.

They will cease to exist.