This Gilded Abyss: The Titan's Wrath Book 1

In this gripping underwater adventure, Sergeant Nix Marr is called back into danger when she joins a covert mission to investigate a deadly sickness threatening an underwater city and its passengers. As the crew uncovers frightening truths about the infection, tensions rise and trust becomes a dangerous game in the depths of the ocean. With a murder on board and secrets lurking beneath the waves, Nix must navigate her past and uncertain alliances to survive the unfolding crisis.