Dreams of apocalyptic scenarios, like the one you experienced, can evoke strong emotions and often symbolize feelings of anxiety, change, and the need for safety in your waking life. Here are some interpretations of the key elements in your dream:

1. End of the World & Flood: These themes often represent feelings of being overwhelmed or a significant change that feels out of your control. It may reflect a current situation in your life where you feel things are chaotic or uncertain.
2. Choosing Shelters: Your choice of an underground shelter on an island indicates a desire for safety and stability during turbulent times. This may suggest that you are looking for a secure place in your life, both physically and emotionally. The fact that others chose different paths could symbolize how people in your life are handling their own challenges differently.
3. Division into Groups: The voluntary division into groups may reflect your feelings about community versus isolation in times of crisis. It could indicate how you perceive the choices of others around you and how their decisions affect you.
4. Searching for Food: Finding food in your dream symbolizes the need for nourishment, not just physically but emotionally and spiritually as well. It may suggest that you are seeking sustenance or support during a difficult time.
5. Meteorites and Chaos: The chaos caused by meteorites may symbolize unexpected challenges or fears that suddenly appear in your life. This could represent worries that disrupt your peace of mind.
6. Sealing the Entrance: The act of sealing the entrance with wire mesh can represent a desire to protect yourself from outside chaos or influences. It may also reflect feelings of confinement or a fear of missing out on opportunities.
7. Those Who Didn't Make It: Seeing those who didn't make it may symbolize feelings of guilt or concern for others in your life who are facing struggles. It could also reflect your fears about the consequences of choices made in difficult situations.

Insights and Advice:

• Self-Reflection: Consider what areas of your life feel chaotic or overwhelming and explore ways to regain a sense of control.
• Community Support: Reflect on your relationships with others and how they influence your choices. Seek support from those you trust.
• Emotional Nourishment: Pay attention to your emotional and spiritual needs. Engage in activities that provide you with comfort and fulfillment.
• Coping with Change: Embrace the changes in your life rather than resist them. Finding ways to adapt can help ease feelings of anxiety.

Overall, this dream suggests a complex interplay of your fears, desires for safety, and the need to navigate through life's uncertainties. Consider journaling or discussing your feelings with someone you trust for further clarity.