Editing Roof and tunnel hacking (section)

==Vadding==
Vadding is a verb which has become synonymous with [[urban exploration]].{{citation needed|date=January 2023}} The word comes from [[Massachusetts Institute of Technology|MIT]] where, for a time in the late 1970s, some of the student population was addicted to a computer game called [[Colossal Cave Adventure|ADVENT]] (also known as ''Colossal Cave Adventure'').  In an attempt to hide the game from system administrators who would delete it if found, the game file was renamed ADV.   As the system administrators became aware of this, the [[filename]] was changed again, this time to the permutation VAD.  The verb ''vad''  appeared, meaning to play the game.  Likewise, ''vadders'' were people who spent a lot of time playing the game.{{citation needed|date=January 2023}}

Thus, vadding and vadders began to refer to people who undertook actions in real life similar to those in the game.  Since ADVENT was all about exploring tunnels, the MIT sport of roof and tunnel hacking became known as vadding.{{citation needed|date=January 2023}}

Today, the word vadding is rarely used at MIT (usually only by old-timers) and roof and tunnel hacking has returned as the preferred descriptive term.  Those who participate in it generally refer to it simply as "hacking".{{citation needed|date=January 2023}}