Dreams involving danger, captivity, and concerns for loved ones often reflect deeper emotions and anxieties in waking life. Here’s an interpretation of your dream:

1. Feeling Trapped or Vulnerable: The scenario of being caught by a gang signifies feelings of vulnerability or being trapped in a situation you cannot control. This may relate to current life stressors or responsibilities that feel overwhelming.
2. Concerns for Family: The persistent thoughts about your wife and kids highlight your protective instincts and the weight of responsibility you feel for their well-being. This aspect suggests that you may be experiencing anxiety about your role as a provider or protector, possibly linked to real-life pressures or fears.
3. Setting and Context: The coastal Australian city and the underground passages could symbolize a juxtaposition between the surface (tourist-friendly, carefree) and the hidden depths (caves and passages representing your subconscious fears or unresolved issues). This contrast might reflect your perception of life’s challenges beneath a seemingly normal exterior.
4. Ransom: The ransom element could symbolize a feeling of being demanded to give more than you can afford, whether it’s emotionally, financially, or in terms of your time and energy. It could also represent a fear of losing something valuable to you, such as your family’s peace of mind.
5. Waking Up: Waking up at a moment of high tension in the dream could indicate that you are alert to these underlying issues in your life and need to address them before they escalate.

Advice:

• Reflect on Current Stressors: Take some time to identify any sources of stress in your life that may be contributing to these feelings. Consider discussing your feelings with your spouse or a trusted friend.
• Communicate: Ensure open communication with your family about your concerns and feelings. This can help alleviate some of the anxiety you might be experiencing.
• Self-Care: Engage in activities that help you relax and recharge, as taking care of yourself is crucial for managing responsibilities and anxiety.

Dreams can serve as a powerful tool for self-reflection, so consider this interpretation as a way to explore your feelings and address any underlying concerns.