My Four Seamen by Laura Wylde

Evan, Terrance, Collin, and Carter who are ex-Navy Seals, have a strong friendship that was torn apart by a tragedy. As they try to rebuild what they once had, they are struck by something else. Something that doesn’t seem real…
A mysterious creature that dwells in the waters of the Bermuda Triangle has surfaced..
Just as the ex-military men believe the end has come, an unexpected savior comes to the rescue.
But she’s no ordinary angel.
These seamen have to make an impossible choice.
Can they leave everything they have ever known behind just to stay alive?
For her it might be worth it…