i have had great luck with them.
When I fire a "fish" at a DD and it misses, if the DD is within 500 meters, I can deploy one, and go to flank speed and turn 90 degrees, head to 120-150 meters depth, and go to silent running when the depth is achieved. With the external cam, if deployed correctly, you will see the DD stop and actually back up for however long the "Bold" is designed for.
If you use it correctly, it can save your butt.
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