Why was hall concerned that the germans would learn about the british reading their secret messages

Hall was concerned that the Germans would learn bout the British reading about their secret messages because the Germans would then find different way of transmitting their messages.

Explanation

The above question relates to an event in a spy thriller book by Paul Janeczko named The Dark Game: True Spy Stories. The story is about the clash between British and  American interests ever since George Washington played a big role in hurting British interests. It was the turn of Britishers to avenge for the wrongs that were done to them, leaving no opportunity to hit them back. The Dark Game is a collection of stories where spying and espionage are the key ways to fight each other and try to bully at every opportunity. Other sophisticated methods such as clothesline code, cyber spying as well.   The two sides have been wonderfully represented by Arthur Zimmermann and Mr. Hall where Hall somehow manages to read the secret messages of Germans. The center of all attention was Room 40 from where all secret information and messages were intercepted and read. Therefore, Mr. Hall tried to figure out as to what exactly would happen next. He started to think of an alternative method of transmitting their messages.

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