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What role did the ship Apollo play in L. Ron Hubbard’s Scientology work?

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The Apollo was a seagoing vessel that served as a primary base for L. Ron Hubbard’s research during a pivotal period in the development of Scientology.

After resigning from his official church offices in 1966, Hubbard spent time aboard the ship focusing on the development of advanced thetan (OT) levels. During this time, he also established a fraternity of dedicated church members to whom he entrusted the movement's most advanced teachings.1