What is the first action to take in the event of an explosion onboard?

In the event of an explosion onboard, the first action to take is to call away the in-port emergency detail. This is crucial as it mobilizes the appropriate personnel and resources to respond effectively to the situation. The in-port emergency detail typically includes individuals specifically trained to handle emergencies, allowing for a coordinated response to mitigate further harm, assess injuries, and commence firefighting or other necessary actions.

Establishing communications with the Central Control Station (CCS) is also important, but it typically comes after notifying and calling away the emergency detail, as coordinating the response effort is immediate priority. Similarly, raising an emergency flag and securing all entrances are important steps but they follow the initiation of the emergency response. The swift engagement of trained personnel ensures that assistance is rapidly available and that safety protocols can be enacted without delay.