Very, very risky procedure.  Offered in underground clinics here in US in the 90s - now essentially stamped out.  A patient is put under general anesthetic and then is given flumazenil (an anti-benzodiazepine drug) to precipitate benzodiazepine withdrawal.  Takes about 36 hours.  Theoretically, the non-benzo sedatives keep the patient's brain from seizing, keep the patient fully sedated while the central nervous system is forced to make a rapid adjustment to being absolutely benzodiazepine free.  The goal is to 'wake up' two days later no longer physically dependent.  It sometimes works short term, sometimes really hurts the patient (multiple deaths reported).  The hardest news for people is that it essentially never works long term.  

Desperate people take this terrible risk believing that the only obstacle to recovery is getting physically free of chemical dependence.  They have usually tried and tried to get drug free and have lost patience with the whole slow, careful, therapeutic process.  We call it terminal uniqueness. They tragically believe they are different than everyone else and can take a short cut.  Ultra-Rapid Detox is a short-cut that can cripple (or kill).

Shame, such a talented, intelligent man - as many addicts are.