Main navbar and sub-navbar

I have a website that has a main navbar (shown as the top/white navbar in the image).

enter image description here

Of the top navigation links, one of them takes you to another page that is much more customizable and offers many more features than the other (top nav) pages do. It warrants having multiple pages of its own, under it's own directory structure like so:

- MyWebsite
   - nav 1 (top-level)
   - nav 2 (top-level)
   - nav 3 (top-level)
   - <link to current page> (top-level)
         - nav 1 (second-level)
         - nav 2 (second-level)
         - nav 3 (second-level)
         ...

It would not be appropriate to make the <link to current page> be a dropdown / submenu to select nav 1, nav 2 such as those shown on the bootstrap dropdowns

Is there a more sensible way to have both of these methods of navigation separated without having "two" navbars? Currently it feels extremely wrong, possibly because there's a gap between the two?

UX is a familiar area of mine but I haven't ever needed two navs before. Would possibly a side navigation (or something of the sort - different than a 2nd top nav) help fix this issue?

I've seen images (which happens to be from a stack overflow question) where there's two navs, but the 2nd nav's content seems appropriate. In my instance the type of content is much different.

Appreciate any help, thank you.

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