to swim as deep as you can under water without using breathing equipment

He plans to freedive through an ice hole on a frozen lake in Sweden to a depth of 131ft in water temperatures of -2C. 他计划通过瑞典一个湖上的冰洞，在零下2摄氏度的水温里下潜到131英尺的深度。

I practised holding my breath so that I could free-dive deeper to catch abalone and lobster off the Malibu coast. 我练习屏住呼吸，这样就可以自由潜入更深的海域，在马里布海岸捕捉鲍鱼和龙虾。

an act of swimming deep under water without using breathing equipment

I flew out with some friends to Norway and we pioneered the first freedive beneath polar ice. 我和几个朋友一起飞到挪威，在极地冰下进行了人类第一次自由潜水。

He set a new depth record for a free-dive. 他创造了自由潜水的新深度纪录。