The Vendée Globe sees opponents participate in a gruelling 24,000 mile (39,000km) crusing race around the globe.
They should sail fully on their very own and get by on solely brief bursts of sleep.
Fewer than 100 folks have ever accomplished the problem.
The powerful circumstances are prone to have an effect on the sailors’ psychological well being, so competitor Pip Hare is taking some tech along with her that is designed to watch how she feels.
Zoe Kleinman finds out extra for BBC Click.