Tech pan doesn't take well to underexposure(as does any slow film). I've never tried to push process it. A couple of clip development tests might yield some useful information with technidol, starting at 10 minutes and going up to say 20 minutes.(posted 9182 days ago)If you can get hold of some Ethol TEC, it yields an E.I. of 100 and might be able to save them. Also a couple of Photographers Formulary developers might work as they also claim to get an E. I. of 100( I've not tried them).