Your dream contains powerful imagery and themes that can be explored for meaning. Here are some interpretations and insights:

1. White Marble: The white marble may symbolize purity or clarity, suggesting a desire for a clean slate or a search for enlightenment. However, the starkness of the marble can also imply feelings of isolation or coldness.
2. Closed Door: Opening a door often represents new opportunities or discoveries in your life. It could indicate that you are ready to confront something unknown or hidden.
3. River of Blood: This part of the dream may symbolize deep emotional struggles or trauma. Blood often represents life force, and a river of blood could suggest that you are feeling overwhelmed by intense emotions or past experiences.
4. Undead Humans: The presence of the undead could represent unresolved issues or aspects of yourself that you feel are 'dead' or neglected. They may symbolize fears or anxieties that are resurfacing.
5. Wheel Turning: The wheel could represent the cycle of life and death, and the act of turning may suggest that there is a force beyond your control that is influencing your life. It may also symbolize the ongoing struggle of dealing with your emotions or past traumas.
6. Drowning: Drowning in the river of blood may represent feeling overwhelmed by your emotions or circumstances in your waking life. It could indicate a fear of losing control or being unable to cope with the weight of your experiences.

Overall, your dream seems to reflect inner turmoil, the confrontation of past experiences, and the struggle to find clarity amidst chaos. It could be beneficial to explore these feelings and consider if there are unresolved issues in your life that need attention. Engaging in self-reflection, talking to someone you trust, or seeking professional help can be valuable steps to take.