Editing Jefferies Tubes (section)

==24th century==

During the 24th century, Jefferies tubes became more simple, less intricate and not as thoroughly filled with vital systems. 

The vertical tubes on starships allowed manual access to decks both above and below, which were labeled inside these particular tubes. Dim lights were located behind the main ladder and other lights were found on every deck. These tubes were equipped with a single one-way ladder for crewmen to climb or descend. 

The horizontal crawlways on starships allowed manual access to various vital parts of a ship or station. Dim lights were located near the floor and on each side of the tube. Crewmen usually had to crawl while traveling in them due to the cramped size. Inside these tubes were removable panels to important system conduits and engineering controls. 

On 24th century starships, all Jefferies tubes had junction service rooms. They served as interconnected points linking all the different tubes. Every room had exposed conduits on the walls, sometimes with panels to access various power conduits or relays.

According to Nella Daren, the fourth intersect of Jefferies tube twenty-five was the most acoustically perfect spot on the USS Enterprise-D. (TNG: "Lessons") 

[[category: Engineering]][[Category: database]]