Should Governments Risk Giving Away Secrets to Save Lives?

During WWII, if government officials had information that Germany was planning to sink a certain ship (or ships), would the government have a moral obligation to share that knowledge and prevent the sinkings? Why, or why not?

What if acting on the knowledge would have given-away the fact that Britain's code breakers were understanding Germany's encrypted messages? Under those circumstances, what is the moral path to follow regarding the soon-to-be-attacked ship(s)?

If you were a member of the decision-making team, and you had a close relative on board the ship, would you be able to make the right call to inform (or not inform) the ship's captain? If you couldn't set-aside your personal feelings, should you step-away from making the decision?

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