Cannot Access Dead Subsite

I have a subsite that of a sudden refuses to open.

When attempting to access the subsite/pages/default.aspx page it just time out. I have little luck tracking down the error. I attempted to open the management page with subsite/_layouts/settings.aspx and get the same time out.

I cant afford to lose the subsites to this one as there is a lot of data there, and those subsites work if navigated directly to.

I have tried iisreset, no help.

All the other subsites at the same level in this collection work.

Whats the best way at this point to recover my dead site?