"Spy Sea Within a Stratagem" 更常见的英文翻译可能是："Deception within Deception in the Spy World" 或 "A Plan Within a Plan in Espionage". 注：原句可能是某种特定的名称或者成语变体，具体翻译可能需要根据上下文进行调整。

Inception is a film about the US Central Intelligence Agency (CIA), which reveals some unknown inside stories of the CIA, including how to recruit trainees, how to carry out spy training, and how to survive in that mysterious environment.