Life support ductwork
The life support ductwork is an important part in the infrastructure of the life support system aboard a Federation starship.

When Doctor Beverly Crusher was caught in a shrinking warp bubble in 2367, she imagined that Lieutenant Commander Geordi La Forge told her that his engineering team had even crawled though the life support ductwork in order to find out what may have caused a mysterious vortex seen by the doctor in sickbay. ()
Life support technology