Conestoga bulkhead

Archer and T'Pol identifying a bulkhead of the SS Conestoga

"Sir, we have a bulkhead breach."

A bulkhead was a wall-like partition in a starship or space station used to aid structural integrity.

Captain Jonathan Archer identified a part of a building of the Terra Nova colony as a bulkhead of the SS Conestoga. The colony ship was dismantled and its parts were used to build the colony. This specific bulkhead was from the ship's B-deck, section 14. (ENT: "Terra Nova")

Bulkheads were numbered and divided a ship into separate parts to help keep its rigidity. Bulkheads in Starfleet vessels built in the 24th century, specifically of the Galaxy-class and Intrepid-class, were composed of tritanium alloy and could be reinforced with shields to enhance the ship's overall structural integrity. (TNG: "Where Silence Has Lease"; VOY: "Repentance")

In case of structural failure, a bulkhead could be beamed away and temporarily replaced by a force field. (TNG: "Schisms")

Bulkhead hull breach

A hull breach in a bulkhead of DS9 in 2369

In 2369, the bulkheads aboard space station Deep Space 9 were broken by several hull breaches caused by graviton pulses of the embryonic lifeform. (DS9: "Q-Less")

While searching the debris of destroyed Vor'cha-class attack cruiser IKS Toh'Kaht, Jadzia Dax and Miles O'Brien found pieces of the ship's secondary hull and bulkheads in the debris. (DS9: "Dramatis Personae")

Jadzia Dax claimed she could hear Kor snoring through the bulkheads of the USS Rio Grande in 2372. (DS9: "The Sword of Kahless")

Elim Garak had "a sudden and somewhat violent encounter with a bulkhead" when the USS Defiant was attacked by the Dominion early in the Dominion War. (DS9: "A Time to Stand")

In the final draft script of ENT: "The Catwalk", Charles Tucker III used the phrase "driving me up the bulkhead!" in reference to annoyance he had about a group of Takret who were temporarily residing aboard Enterprise NX-01. The phrase, clearly a version of the real-world idiom "drive up the wall", is not used in the final edit of the episode, though, in which Tucker instead states, "driving me crazy!"
In an unused scene from TOS: "The Enemy Within", good Kirk corrects McCoy's usage of the word "wall" rather than "bulkhead". In another scene from TOS: "The Deadly Years", aged Kirk describes himself as feeling like he's been kicked through a bulkhead. (Star Trek: Lost Scenes)

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