is the sound of the double d in suddenly a glottal stop (ʔ)?

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ʔ ] unvoiced unaspirated radical glottal stop

Glottal stops Literal-Minded

PDF] Word-initial glottal stop insertion, hiatus resolution and linking in British English

Darin Flynn - University of Calgary

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The Glottal Stop /ʔ/ - connected speech

The Glottal What? A Pronunciation Guide to the Glottal Stop - Pronunciation Studio