Very technical in the beginning. Loved Will Dean's other books. This one I did not feel was as good. All the teachnical stuff made it hard to get interested in the story. It did get better. 3 stars

Six experienced saturation divers (divers who remain pressurized for a period of time, often for weeks), are locked inside a hyperbaric chamber on a job. Rapid decompression would cause death. They spend their time working two to a shift and otherwise live in very close quarters (think an extended VW bus.) Then one of them is found dead. Their chamber cannot be opened for four days. Then a second diver is found unresponsive. What is happening? And will any of them survive?

Oh, this was a really good, tense thriller. First, the topic was so interesting. I love books which cover an intriguing topic and saturation diving and the crazy, wonderful people who are willing to do it was a perfect choice. I was totally unaware that this even existed, and I was fascinated to learn the specifics about it. The author hit all the right notes, giving readers just enough information without overloading the text with unnecessary technical stuff. Loved that.

Then, the mystery itself. Also very good. A locked room mystery set in a literal metal tube. It doesn’t get much better than that. The suspects were almost never out of sight of one another. I did guess the culprit, but not the why, and the whole thing was incredibly satisfying. Giving this one 4.5 stars, which might be high, but I just enjoyed it so thoroughly and I couldn’t go to bed until I finished it. Highly recommended.

Will Dean has done it again! This book had me holding my breath and immersed in the claustrophobia from chapter one. We follow a small group of divers as they descend to the ocean depths in a tight packed hyperbaric chamber. When one of the diverse turns up inexplicably dead in his bunk, the dive gets called off. But decompression to bring the team back up takes 4 days, and as time goes things turn bad and worse. I literally felt dizzy at times reading this! The author did such an incredible job immersing us in the tight quarters of the chamber with the divers. This truly felt like such a unique thriller and I can’t wait for the rest of the world to get their hands on this too.