A Cry from the Deep — Diana Stevan

In this time-slip romantic adventure, Catherine Fitzgerald, an underwater photographer, gets a call to join the dive team searching for a lost ship from the Spanish Armada. 
 
Reluctant to dive again due to a near death diving accident nine years before, Catherine, now divorced with a seven-year-old, leaves her lavender farm in Provence and travels to Miami to meet notorious salvager, Hennesey, who'll be heading the hunt. 

But before Catherine decides to take the assignment in Ireland, she buys an antique Claddagh ring and begins to have troubling dreams of a woman from another time. The mystery of why this spirit is haunting her becomes as compelling as the hunt itself.

But what does these nightmares have to do with second chances? Is Catherine destined to spend the rest of her life single, or does fate have another plan? Should she consider getting back with her ex, a psychiatrist in New York, who still loves her, or is there hope for something more with the unavailable but strangely familiar marine archaeologist on the dive team? 

Set in Provence, Manhattan, and Ireland, this story is ultimately about an unfulfilled love in the past playing out in the present.