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Memory Alpha

Ceteacean Ops was a facility on board the alternate universe USS Enterprise-D created by a time traveling USS Enterprise-C. (TNG: "Yesterday's Enterprise")

The term "Ceteacean Ops" was only heard in the "background chatter" during the episode. The existence of a comparable facility was canonized in the episode "The Perfect Mate", but it was not mentioned by name in that episode. To date, the facility has never been shown on screen, yet conceptual artwork at Andrew Probert's website suggests that the facility may be featured in Star Trek Online.
During the production of Star Trek: The Motion Picture, a ceteacean facility was considered to be housed in the Enterprise engineering hull, evident from the conceptual artwork displayed here.
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