Pix will come out, but it will have a dark base level of density along the entire filmstrip, underneath the images. This will eat up any tones that fell at or below this level.
If it is a low enough level of density, you can still use the film for pretty normal-looking pix, if you expose and develop accordingly.
What I would do is to just pull out about 8 inches of one roll (in total darkness, of course), trim it, and piggyback it on another b/w roll with a similar development time the next time you process film. This will show you how much density an unexposed section of the film will achieve when developed, and thus let you know if the film is worth shooting, and if it is, how to expose when you go to use the film.