Lifemaker (The Great Iron War, Book 2)

The Regime is on the hunt, forcing the Resistance to take refuge aboard the Lifemaker, an advanced submarine that houses a special cargo: a handful of women who can still give birth to human children. To evade the Regime's own submersibles, all parties must work together, but tensions are high, and not everyone on board is looking out for the greater good. As they descend into the deeps, they quickly learn that not all monsters work for the Regime.