Michelina Lewendowska,27, was buried alive in a cardboard box has told a British court the harrowing tale of how she got out alive. ABC NEWS

It's a nightmare that none of us ever want to live through. A woman who was buried alive in a cardboard box has put into a vivid picture how she used her diamond engagement ring to cut the bonds off her hands and legs free, and then hack her way out of the box.

Michelina Lewendowska, 27, told her traumatic tale at British court while testifying against her ex-fiancé Marcin Kasprzak and his friend Patryk Borys, who are both currently on trial for attempted murder.

Lewendowska told the court her fiancé attacked her with a taser in their home last May in her native Polish.

"I was trying to push him away with the taser. He knelt down, he pressed my ribs with his knee and continued to use the taser," she said.

Kasprzakthen proceeded to tell her that he had hated her for 4 years and he was taking their son to a secret house where she'll never see him again. Lewendowska was tasered two times in the neck before being bound and gagged and put into a cardboard computer box.

The mother of one told the court Kasprzak and Borys taped the box shut, put her in the trunk of a car, then drove her to the woods and buried her under nearly half a foot of dirt before leaving her for dead.

It was then that she thought to use what was ironically a gift from her attacker, her engagement ring.

"I started to tear the box apart. I was focusing on the opening I had just made. Soil was getting in. My face was getting dirty. I could see some black sky and leaves. I was so exhausted," she said.

Lewendowska believes that it took her a half hour to cut herself out of her cardboard coffin. She then received help from passing motorists.

Kasprzak and Borys have pled not guilty to charges of attempted murder.