Your dream presents a vivid and complex narrative that can be interpreted in several ways. Here are some insights and themes that may resonate with your experiences and emotions:

1. Swimming and Playfulness: The initial scene with you and a group of people swimming and having fun in a hotel pool suggests a sense of community and joy. This may represent your desire for connection, leisure, and enjoyment in your waking life. The hotel setting might symbolize a transitional phase or a temporary state in your life.
2. Feeling Threatened: The moment when the man resembling your friend drags you underwater could symbolize feelings of being overwhelmed or controlled by someone or something in your life. It might reflect anxieties about losing your autonomy or being unable to breathe under pressure, whether from relationships, work, or personal challenges.
3. Isolation and Reflection: After the near-drowning, when you wander the hotel and find the balcony overlooking a city and an erupting volcano, there is a shift to a more introspective phase. The city at night can symbolize unknown possibilities or opportunities, while the volcano represents potential danger or explosive emotions that may be lurking beneath the surface.
4. Witnessing Harm: The scene where your friends jump into the lava and become consumed can indicate feelings of helplessness or fear of losing those close to you. It might reflect worries about friends making destructive choices or being drawn into situations that are harmful, despite your attempts to intervene.
5. Transformation and Loss: Seeing the skeletons of your friends at the end of the dream may symbolize a transformation, loss, or the consequences of actions taken without consideration of their dangers. It could point to a realization about the fragility of life and relationships.

Advice: Reflect on your current relationships and any situations where you feel overwhelmed or unable to help those around you. Consider whether there are aspects of your life that require you to assert your boundaries more firmly. This dream may be urging you to address feelings of pressure, to seek clarity in your relationships, and to take care of your emotional well-being. If you sense that some friends are heading toward risky behaviors, it may be worth having open conversations with them.

Overall, your dream contains powerful imagery that speaks to both fears and the need for connection. Take time to explore these feelings and how they manifest in your waking life.