Swimming is not a requisite for the Son Doong Expedition, as there are no required swimming sections. However, you have the option to take a dip and enjoy a swim at the Hang En cave – the world's 3rd largest cave.
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The unexplored kingdoms of the earth, where humans dread to enter and undiscovered species live. They're gorgeous, but considered out of bounds. Son Doong Cave (Mountain River Cave in Vietnamese) is the world's largest cave located in Quang Binh province, Vietnam.