Dreams featuring deceased loved ones often hold deep emotional significance, reflecting our connections to them and our feelings about loss. In your dream, helping your grandfather may symbolize your desire to support him, even in the afterlife, indicating unresolved feelings about his passing. The act of alerting for help when he clutches his chest could represent your instinct to protect loved ones or your fear of losing them again.

The dark tunnel you floated through can be interpreted as a passage between different states of consciousness or realms, often associated with transitions in both life and death. The geometric flowers might symbolize beauty and the cyclical nature of life, representing growth and transformation. In various cultures, flowers are often seen as symbols of rebirth and the continuation of life beyond physical existence.

The clocked figures, one white and one black, may represent duality and the balance between light and dark, good and evil, or life and death. In many spiritual traditions, white often signifies purity, peace, and the divine, while black can represent the unknown, mystery, or the subconscious. Their facelessness might suggest that these forces are beyond human understanding or represent aspects of yourself or your situation that you are grappling with.

Your inability to scream and the search for your fiancée could indicate feelings of helplessness or anxiety in your waking life, suggesting that you may feel disconnected from those you love or from control over your circumstances.

In summary, this dream could be a manifestation of your feelings about loss, protection, and the transition between different life stages. It may also reflect your inner struggles with fear and the unknown. Engaging in reflection or conversation with a trusted friend or spiritual advisor about these feelings might help you gain further clarity and peace.