A “abnormal condition” noted at Russian spaceship Luna-25 as it prepares to enter lunar orbit, was the puzzling announcement from the Russian space agency Roskosmos on Saturday.

Experts are analyzing the situation, according to the same source, who did not release more details. Estimates refer to a technical problem, without its severity being known

Russian spacecraft is scheduled to land on the moon’s south pole on Monday to look for ice water.

Luna-25, which is about the size of a small car, is intended to operate for a year at the Moon’s south pole, where scientists at NASA and other space agencies in recent years have detected traces of frozen water in craters.

The existence of water on Earth’s natural satellite is expected to change the data in future missions to the Moon by major space powers, potentially allowing for longer periods of human habitation on the planet, which would enable the mining of lunar resources.