Cargo bays have been used in a variety of ways other than typical storage, including triage centers, brigs, and stasis unit facilities.
Cargo Bay 4 aboard the USS Enterprise-D was located close to the outside of the ship and could be decompressed easily by blowing the cargo bay hatch. (TNG: "Power Play")
The USS Voyager had several bays with the designation "Cargo Bay 2". One had variable environmental controls and was designed for organic storage. It was converted to a hydroponics bay by Kes in 2371 in order to allow for the growth of foods for consumption. Another was located on Deck 4 and suffered a massive hull breach when a Kazon shuttle intentionally collided into it in 2372. In 2374, the Borg assimilated a third "Cargo Bay 2" during an alliance with Voyager. After the alliance, four Borg alcoves remained in the bay and it went back to normal cargo storage. This "Cargo Bay 2", however, was located on Deck 8. (VOY: "Parallax", "Maneuvers", "Scorpion, Part II", "Equinox", "The Gift")
Yet another "Cargo Bay 2" was referenced in VOY: "Night" by Neelix, who proposed the installation of holoemitters to convert the room into a third holodeck; this is assumed to be a different cargo bay than Seven of Nine's, as she would likely object to the conversion of what is essentially her quarters into a public recreation area. The shifting location of Cargo Bay 2 was never explained in dialogue and has never been directly addressed by any member of the production staff. It is presumably simply a mistake made by the writers of those individual scripts, who did not keep up with the location of that particular cargo bay. Alternatively, Voyager was stated several times in the early seasons to have three cargo bays, three transporter rooms, and three holodecks; early drafts of the scripts in question may have referenced the supposed third cargo bay, only to have the reference number corrected in later drafts without also making the location consistent. In any case, the location is most definitively established in VOY: "Scorpion, Part II", which depicts from outside the ship the decompression of cargo bay 2, whose external door is located on what appears to be Deck 7 or Deck 8, on the edge of the saucer section.
Indeed, the confusion of exactly how many cargo bays the USS Voyager has is only complicated by comparing the physical filming model with examples from dialogue. In VOY: "Macrocosm", Janeway clearly says to The Doctor that he has a clear path to "both" cargo bays. Yet, close analysis of the filming model clearly shows a total of three hatches like the one seen in VOY: "Scorpion, Part II" – one on each side of the saucer rim, and a third at the forward tip just below the auxiliary deflector.
According to the VOY Season 2 DVD trivia text version of "The 37's", the Voyager had two cargo bays located on the decks 4 and 10.
The USS Voyager had two cargo bays, one on Deck 4 (Cargo Bay 1) and one on Deck 8. Cargo Bay 2 was in section four, and was used for the storage of spare components and surplus materials. (VOY: "Drone")
Voyager's maximum cargo capacity was 35,750 metric tonnes. (citation needed • edit) At one point in 2377, two deuterium tanks were beamed out of Cargo Bay 2. (VOY: "The Void")
When Nog requested a recommendation from Commander Sisko to enter Starfleet Academy, Sisko decided to test Nog's seriousness by asking him to inventory the contents of Cargo Bay 4. Nog completed the task in a mere five hours, and found items that had been overlooked in the previous inventory. (DS9: "Heart of Stone")
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