Wioletta Roslan ... died on her final jump.

Wioletta Roslan ... died on her final jump.

A pregnant Swedish BASE jumper's decision to have one final jump before quitting to become a mother has proved fatal after her parachute failed to open.

Wioletta Roslan, 37, plunged 300m to her death while her partner, Aleksander Domalewski, looked on, the Daily Mail reported.

Roslan was four months' pregnant and wanted to do "one last jump", her mother, Halina Zaniewska-Pettersson, said.

But on her last jump in the Lauterbrunnen valley near Stechelberg, Switzerland, her parachute didn't open.

She struggled with it but when she couldn't release the parachute, she "gave up and spread her arms", her mother told German-language Swiss daily Blick.

"I am very sad and shocked," 68-year-old Zaniewska-Pettersson told Blick. "I have repeatedly asked [Roslan] to stop jumping. But she wanted to keep going. For me it is a double loss. I had become a grandmother.

"She was a true adventurer, travelling to France, Italy, Australia, New Zealand, Thailand, America ... She was full of life and was a wonderful girl. But she couldn't imagine a life without BASE jumping."

In a 2008 Swiss television documentary, Roslan, who worked as inspector on oil rigs, explained her love BASE jumping, which she taken up after starting skydiving at 19. BASE jumping is the extreme sport of jumping from great heights - from buildings, antennas, spans (bridges) and earth - and using a parachute to descend to the ground.

"I feel alive when I jump. I find normal life boring," Blick reported Ms Roslan as saying in the documentary.

"We have a certain amount of time on this earth. And when the sun goes down, then the [game is over]."

smh.com.au