Infiltration is a Toronto-based zine about urban exploration. It features first-person accounts of observational (not vandalistic) visits to "off-limits" areas, including abandoned buildings and steam tunnels. It has been consistently popular through its run; its success spawned the book Access All Areas.
Until 2005, the print version of Infiltration was published, edited, and largely written by "Ninjalicious". The official website now describes the zine's future as "uncertain" and no longer offers subscriptions.