Astronauts heading home from the International Space Station will have to cross their legs due to a leaky toilet.

Toilet

Toilet

Four crew members who are due to return to Earth this month have been informed that they will have to rely on back-up 'undergarments' because of a faulty design on the SpaceX capsule.

Engineers first spotted the issue after space tourists boarded the Resilience capsule in September for a three-day flight and an alarm went off during re-entry.

Crew discovered that urine had pooled under the floor after a tube from the toilet came unplugged and the problem has also been seen on the Endeavour capsule.

William Gerstenmaier, SpaceX's head of mission assurance, said: "There's a storage tank where the urine goes to be stored [and] there's a tube that came disconnected or came unglued.

"That allowed urine essentially to not go into the storage tank, but essentially go into the fan system."