What happens when they go behind the moon in Apollo 13?

When the Apollo 13 spacecraft goes behind the Moon, it loses radio contact with mission control on Earth. This brief period of silence lasts for about 30 minutes while the spacecraft is in the Moon's shadow, making it impossible for the astronauts to communicate or receive instructions. During this time, the crew focuses on critical systems and preparations for their lunar flyby and return journey to Earth. The loss of communication heightens the tension and uncertainty surrounding the mission's success.