Dispaying submenus on node page

Before I go bonkers on this (I have looked up and down in forums), I guess I should seek for help...

On this page, I have sub-menu that shows up as secondary link when user clicks on About SPINN:
http://www.spinn.sg/staging/about-spinn

If the users go on and click "News", the news listing shows up as desired:
http://www.spinn.sg/staging/about-spinn/news

Here comes the problem, if the user clicks on one of the news items to read on, say News Two, the full node page loads, but the secondary menu is gone:
http://www.spinn.sg/staging/about-spinn/news/news-two

Question is: how do I make the secondary menu visible?

I understand there is the way to build secondary blocks, but this makes the maintenance of the site less efficient as we have to define on which pages the block will be displayed. I'm just hoping there is a much efficient way...

Thanks in advance for any help!