Lifeboat is a 1944 Alfred Hitchcock film starring Tallulah Bankhead, William Bendix, Walter Slezak, Mary Anderson and Hume Cronyn.
The Younger Son selected this, never having seen it. The Husband and I had never seen it straight through.
Here's the first part:
The rest of the film is in pieces linked here.
Slant Magazine, the New York Times and Films de France have reviews.
5/30/2010: Great Old Movies blog has a review.