# Why did Skylab have a thick blue flexible cord running down its central axis?

After watching the video below (found here and here and here) I am reminded of the series of possibly less than 100% serious questions here about being weightless in the middle of a large volume and considering the options for reaction masses to get to the side and grab hold of something.

In the video I noticed that there is a central cord or rope to hold on to, possibly for this very reason, or possibly it had a different function as well. What was this for?

Gotta love the vintage music track, one of the zillion instances of the Amen Break (original heard after 01:26 in The Winstons - Amen Brother).

• I never realized Skylab was so big...! – Ludo May 8 '20 at 19:30