The DDS Crew has been breaking into London Underground stations to paint trains for more than 20 years.
Transport for London accuses them of causing GB pound 10 million worth of damage.
Recently, the Crew has been filming themselves in the act.
Now, filmmakers Chris Atkins and Tom Oswald have gained access to their footage for a documentary entitled ‘Underbelly’.
Watch this exclusive preview originally featured this morning on The Guardian’s website.