Character Arc
DCI Amy Silva is a dogged, emotionally guarded detective who is dropped into the worst possible setting for someone carrying unhealed trauma: a submarine running silent beneath the waves. Tasked with solving a death the Navy insists was an accident, she refuses to be managed, intimidated, or sent home, even as the crew closes ranks around her. Her grief and her claustrophobia threaten to break her at every turn, yet they also sharpen her need for the truth.
As the investigation deepens, Amy's professional resolve collides with a private heartbreak, and flashbacks reveal the loss that shadows her every decision. Her bond with Kirsten Longacre is the show's emotional spine, a relationship built on trust, history, and unspoken feeling that the case repeatedly tests. The further she digs, the more she realises that powerful people would happily let her drown to protect their secrets.
By series two, Amy has stepped back onto land but not away from danger, leading a high-stakes inquiry into a drone disaster that exposes corporate and military rot. She is steadier in some ways and more haunted in others, navigating personal milestones alongside another conspiracy that puts her squarely in the firing line. Across both cases she remains the moral centre, refusing to look away when everyone around her wants her blind.