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Thanks.
Got the right words for check.
Here's an interesting one:
All US submarines, as new construction on the Virginia class submarines and retrofitted to the Improved Los Angeles class submarines and possibly Seawolfs, will receive an upgraded Electronic Support suite, designed as a minimally manned, passive receiving system capable of detection, acquisition, identification, and localization of a variety of signals of interest [9]. ES contains the AN/BLQ-10 SIGINT system, which gives detection, emitter location and MASINT identification, direction finding, and strategic intelligence support. It was first implemented in 2000 and should be in all US submarines by 2012 [10].
ES is not limited to the AN/BLQ-10 alone, but a major improvement in receiving, with an expected 200% improvement in performance with the Type 18I periscope and Integrated Electronics Mast (IEM), especially in the littorals. Completing the current ES concept is the AN/ULR-21 CLASSIC TROLL system that increases the probability of SIGINT intercept by 500%, supporting tactical and national requirements.[9]
Signals intelligence collection, submarine-based - encyclopedia article - Citizendium