Ive never tried it but from what i understand, its structured something like this:
Blast for 8-12 weeks at say 3-4ml of Test followed by an 8-12 weeks cruise of 1ml of Test per week, then repeat the blast.
You never allow your HPTA to recover but the reason for dropping the dose for the cruise period is to allow your hormone levels to balance out back to a normal level and for you recepters to have a break.
Its effective because you never have to go through a low Test period like people who cycle have to do during their PCT and recovery period.
As ive said though, blast/cruise is highly more likely to cause permenant damage to your HPTA. I think for it to be worthwhile you have to accept and be prepared for the worst, which would be you have to have TRT for the rest of your life.