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There should be no reason why the Defiant (or any other ship for that matter) under cloak could not send a distress call. Cloaking doesn't interfere with communications, and a distress call is a specialized type of communication. Why a captain would send out a distress call while cloaking is an entirely other question. Firstly it would defeat the cloak and if help would come, they cannot find them easily (unless the cloak is deactivated of course).

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