The launch of the Artemis I Moon rocket to the Moon has been postponed for the second time. This is after the rocket suffered another hydrogen leak, the BBC reports.

The problem emerged early Saturday morning as the launch team in Florida began filling the 100-foot-tall rocket with about 4.5 million liters of hydrogen.

Within minutes, a hydrogen leak was detected near the engine in the rear section of the rocket. Engineers are working to fix the problem with the goal of performing a rocket launch, but have not given a date.

NASA is trying to send an unmanned rocket around the moon before launching a rocket with astronauts on board.

If the mission, which is expected to last five weeks, goes well, astronauts could fly around the moon in 2024 and land on the planet in 2025, marking the second time in 50 years that astronauts have set foot on the moon.