With only a single eel and surrounded by the escort screen, I would "run silent; run deep", and hope to remain undiscovered. An attack could be suicidal.
Why stir up a hornet's nest for a mere 1800 GRT? As has been noted, SH3 does not give credit for damaged vessels, only for those that sink. You are not likely to sink a BB with a single eel.
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Raptor
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