When a main space leak is reported, what is the first action the OOD should take?

When a main space leak is reported, the first action the Officer of the Deck (OOD) should take is to sound the General Alarm. This immediate action ensures that the crew is alerted to the potential emergency situation, allowing them to prepare for evacuation, muster at the designated assembly points, or respond appropriately to the emergency. The general alarm serves as a warning that a significant issue is underway, prompting all personnel to take necessary safety precautions.

Once the alarm has been sounded, further actions, such as securing affected machinery or notifying the Commanding Officer, can be carried out. However, ensuring the safety of all crew members by alerting them first is crucial in situations where there may be flooding or toxic leaks. Promptly addressing the alertness of the crew maximizes the chances of managing the situation effectively and safely.