If the area were on or near the U.S. continental shelf, such data could well provide an enemy with strategically invaluable insights into undersea access routes that could be used to attack some of the millions of Americans who live on or near our coasts.
I've written a lot of books now; I've been published for over 30 years. I hope with every book I learn something new, and with every new novel I try to improve the process of writing.