This is a scene from 2007 that I only discovered recently. Jade Marxxx is suspended from her wrists and has a metal ball tied to her ankles. She is then dunked in a water tank. The only way for her to breathe is to pull herself (plus the weight) up only with the strength of her arms.
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When watching the scene, I was amazed both by Jade being able to hold her breath for an extended time and her body stretching so beatufilly in her bondage.
They pulled her out while everything was still fun, but imagine having to endure this for hours, with your strength slowly fading, the water gradually getting colder and your panic of eventually drowning rising...