The Black Hole

The Black Hole was Jagex's early punishment system back on RuneScape Classic. It existed throughout most of 2001 but was removed by December of that year.

Function
The Black Hole was a place where players who were found to be behaving badly were sent into. It was essentially a place of totally blackness where the players could not move or talk or teleport out of. Players were sent there for an indefinite period of time before being taken out.

The Black Hole Experience
See Disk of Returning.

A lot of players began deliberately misbehaving to see what it was like to be inside of the black hole, so eventually Andrew Gower programmed a clone of the Black Hole, dubbed "The Black Hole Experience". Players went into the western section of the Dwarven mine (to where Boots the Dwarf presently can be found on present-day RuneScape) and purchased a Disk of Returning from a dwarf named Thordur for 10 coins. Once a player had a disk in their inventory they were allowed to go down the ladder into the mock black hole.

The Black Hole Experience was eventually removed, along with the real thing, due to players attempting to scam one another by claiming that "something really cool" would happen if players dropped the disk while in the hole, effectively trapping them until Jagex rescued them.