Jefferies tube

Jefferies Tubes are generally small access routes to various starship and starbase systems.

Jefferies tubes provide access to numerous systems and are most frequently used by engineers carry out maintenance and repairs. Tubes can also be used as alternate routes should the normal corridors and turbolifts be cut off and the knowledge of Jefferies tubes networks by a ships crew can often be used to provide a tactical advantage in a boarding situation.

Information
Jefferies Tubes were named in honour of Matt Jefferies, the designer of the original series starship Enterprise