In the 2nd half, the team of divers face that the Arcadia ship was sunk on purpose and why it felt alive and moving. There were reasons that the ship was not explored and it was only realized when they faced what the ship had been showing. This book is closely tied to subtle and descriptive horror that does not have too much action. The theme is ignorance since they do not 100% know each other's true self as they also ignore signs of the abnormal.

Opening to a team of divers explorning the lost ship SS Arcadia as their dives shows the paranormal activities on the ship. I would recommend this to those who enjoys the sureal horror work of Junji Ito. Written in third person omniscient the author was able to smoothly intervene between dialogue to add the details on how and why the team was able to get together and work, and through the characters emotion is one of the main way it was shown.