Hickson, 30, is a Bristol-based mental health practitioner, and when her freediving training allows teaches swimming to children with special needs.
She holds all the UK pool freediving records and has moved on to depth only this year. She was named the women’s UK Depth National Champion in July.
Hickson said she had focused on CNF in Cyprus because she hadn’t “had the chance to do this in the cold quarry back home, and it’s probably my favourite discipline”.
“The dive felt amazing and it was the icing on the cake to break the long-standing record,” she said. “The most important thing for me is to enjoy the dive, and I loved every second.”