OT 3 was and is an enormous Evaluation by Hubbard.
The Clearing Course, OT 2, and OT 3 are about implants.
Video from the 1968 confidential 'Class 8' course.
There's a "explanation," by Hubbard, of the Clearing Course Implants, OT 2 Implants, and OT 3 implants on 5:10 to 6:10 of this video.
Hubbard told Scientologists the most important parts of the past, the super traumatic incidents that they needed to contact, and "process," in order to survive. Without him, they would have been doomed, so the idea goes.
Hubbard virtually owned Scientologists by giving them their future and scaring them. "Your next agonized endless trillions," etc.
From old timer John Sanborn, speaking of the 1950s:
"In a Phoenix Congress... he talked about spooky whole track stuff. He had a floodlight on the floor in front of this little platform shining up, because that makes you look ghouly. And his face looked really weird and outer space and really crazy... and he talked weird... I think he was trying to drive people a little bit wacko so they'd fall into his hand a little bit."
A combination of method and madness. That seems to be the recurring pattern. 1938: Hubbard wrote passionately about his "real goal" of attaining "immortality," not through spiritual means, but through becoming a legend by "smashing his name into history." Yet, he had just written a manuscript titled 'Excalibur', which presented a "philosophy" that extolled "Survival!" At the center of this impulse to "Survive!" would be Hubbard himself, his name, that he would smash into history. That sounds a lot like madness. Yet there was a method also.
Seventy years later, Scientology (and the "Church of Spiritual Technology") has, as its (not publicized) primary mission, the preservation of the name of L. Ron Hubbard. That's the "real goal," the goal behind the shroud of spirituality and humanitarianism. And that's madness, but with a method.
"Xenu" and "OT 3" are a similar combination of madness and method. Having traveled to Southern Africa with high hopes of becoming Mr. Big, Hubbard was unceremoniously booted out. Why? What could cause people to reject the majesty and power and charm of L. Ron Hubbard? What engram could cause such irrational behavior? What could explain why people were not recognizing L. Ron Hubbard as the Great Man of the Age? What could it be? It would have to be something tremendous. Something overwhelming of a galactic magnitude. More madness.
Yet also a method. Hubbard wrote of the importance of "using enemy tactics," and would even use those "enemy tactics" on his own loyal followers. He had written of psychiatrists in August 1963:
"Psychiatry is authoritarian and tells the person what's wrong with him, often introducing a new lie. Scientology finds out what's wrong with the person from the person."
Soon to follow, in 1965 and 1966, would be the secret and very serious and very dangerous yet vital to one's survival "Clearing Course" and then "OT 2," and in 1967 - after Rhodesia - "OT 3" (and Xenu), in which Hubbard would do what he said the psychiatrists did. That's madness, yet with a method, with a plan.
Hubbard was already feeling the sting of rejection and ridicule with the Saturday Evening Post article - "Have you been a Boo Hoo?" - when he came up with the Clearing Course.
"To hell with this. I'll become the Commodore of my own private navy and be waited on by 13 year old girls in tube tops and hot pants."
He possibly was motivated to release OT 2 as a level after observing the popularity of John McMaster, the "first real Clear." At first glance, OT 2 looks a lot like Clearing Course part 2. Suddenly McMaster was not so "Clear" after all.
After the further sting of Southern Africa, he invented Xenu, etc.
Scientologists, of course, agreed, with their e-meters confirming it for them, and it became "reality."
When Hubbard had his 2nd mental and emotional breakdown, after the 1977 FBI raids, he "bounced back" by regressing to the time before he knew Mary Sue (who was then on her way to federal prison), and, re-emphasized Dianetics, which, for the first time since May 1950, once again - presto! - "made Clears." He also returned to his primary activity, pre-Mary Sue, and started writing Science Fiction novels, even though he had emphasized, in the early 1970s, that he did not want to be identified as a Science Fiction writer and Scientology was to downplay that aspect of his past.
At the level of Dianetics, post 1978, the person is told he can "go Clear" on Dianetics, and - presto! again - Scientologists did, happily placing themselves in the mental box called "Clear." On Dianetics a person is expected to "go back track" into "past lives," and whatever the person comes up with is "run." Usually the person is delighted with having "run" a "past life," etc., and the auditor is impressed with the way in which the e-meter responded - pretty much as it should have - and everyone is satisfied. Unfortunately, the items run and "erased" in Dianetics usually return - or never actually go away - and the person finds himself addressing them again on such actions as NOTs.
From the lecture "Auditing Comm Cycles" 06 Aug 1963:
"Now, I'll give you an idea - an idea of this. For instance, I know where I was and who I was, and know with good certainty, who I was and where I was in the last eighty trillion years. See, I know that; that's not much of an argument with me. But the small details of that are liable to go fritter-fritter here and there. You know, what did I have for breakfast two trillion years ago? No. Nix, man. Nah. Did I even eat, you see? That sort of thing is getting pretty dim."
From the Clearing Course and also the OT 2 materials:
"Many persons experience unreality at the start of [whole track implant] GPM running; this leaves when you see the meter reads."
And it goes on.....