Best I can remember it is off the rim canal below Roland Martins Marina. I think it is marked on the Okeechobee map they sell there.
.... Ok thanks... I'll check the marina to see if they have the map... Some months back at Slim Fish camp he point it out on the map that he had but don't sell them... The map I have from Bass Pro is nice (fly department) but don't mention the Dynamite Hole..