Final answer:
The indication for submarine emergencies depends on the situation and can include diving deep to avoid collision, surfacing to signal distress, or activating sonar to contact nearby vessels. A combination of these responses may be necessary for different emergency scenarios.
Step-by-step explanation:
The appropriate response for submarine emergencies can be varied and is based on the specific circumstances of the situation at hand. For instance:
- Dive deep to avoid collision may be necessary if there is imminent threat from an above-surface hazard, or if evasive action is required to prevent a collision with another submerged object.
- Surface immediately and signal distress would be the action taken in instances where the submarine needs to make its situation known to rescue or support teams, such as in a severe mechanical failure or other emergencies where remaining submerged would pose greater risk to the crew.
- Activate sonar and contact nearby vessels would be an initial response to understand the vicinity of other objects and communicate with other vessels that may be able to assist.
Therefore, the indicated responses to submarine emergencies may include any or all of the actions mentioned above, depending on the specific emergency situation the submarine and its crew are encountering.