freediving
US /ˈfriː.daɪ.vɪŋ/
UK /ˈfriː.daɪ.vɪŋ/
1.
lặn tự do
the activity or sport of swimming as deep as you can under water without using breathing equipment:
:
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In freediving the diver descends with no more than a lung full of air, to depths of up to 100 meters.