I caught this movie on television over a decade ago, and I think I only watched a few scenes, so apologies if the plot is wrong.

I think a group of people were searching this big mansion after the owner had died. The only scene I remember involves a woman becoming trapped in a small, secret air-tight room. The others eventually notice she is missing and save her, after she is freed by a man she had a quote saying “how sweet the air tastes” now that she knows how it feels to go without it. Like the title says, it was in black and white, possibly 40s/50s.

Thanks in advance!