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

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Phonological potentials and the lower vocal tract, Journal of the International Phonetic Association

Glottal stops Literal-Minded

Glottal Stop /ʔ/ vs. the /h/ sound, Consonant Sounds

Universidade Paulista - UNIP】 は 英語 (アメリカ) で何と言いますか

PDF) The glottal stop between segmental and suprasegmental processing: The case of Maltese

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

Darin Flynn - University of Calgary

Are there languages other than English that commonly replace the letter t with a glottal stop (t-glottalization)? - Quora

What are some examples of sounds which English speakers cannot hear the difference between? - Quora

What are consonant digraphs? - Quora

Learn American English! How to Pronounce the Glottal Stop /ʔ/

Что означает Провиниться? - Вопрос о Русский

Are there consonants that humans can't pronounce? Have any such new consonants been discovered, or has anyone tried to create such new artificial sounds? - Quora