History
San Juan was the first Los Angeles class (688-class) submarine to receive a number of significant improvements to the class's basic design, creating the 688I (for "improved 688"). San Juan and all following submarines in her class are quieter, incorporated an advanced AN/BSY-1 sonar suite combat system. The improvements also included the ability to lay mines from the torpedo tubes. The San Juan 's sail was also strengthen enabling the ability to break through ice.
Read more about this topic: USS San Juan (SSN-751)
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