Reply to Thick Bass help

So I just learned of this song and before you dubstep fans out there kill me for listening borgore, this song is not like his usual grimy music. http://www.youtube.com/watch?v=EPvVbRsA0Cg its actually really intersting, first dubstep song I've heard in 5/4 or any other time signature for that matter. Anyways I'm looking to make that thick bass that comes in right around 40 seconds. I appreciate the help guys.