The book is described as The Martian meets 127 Hours. The storyline follows “a scuba diver in search of his deceased father’s remains who gets swallowed by an 80-foot, 60-ton sperm whale and has only one hour to escape before his oxygen runs out. It’s a tale about a young man who has given up on life — only to find a reason to live in the most dangerous and unlikely of places.”
For a moment I thought this was going to be a spin-off story about the whale who suddenly popped into existence in Hitchhikers Guide to the Galaxy. Unfortunately not.
That would be a short story