Mood: The mood of the video appears to be serene and calming, with a sense of freedom and joy. The woman swimming underwater with a dolphin evokes a sense of playfulness and connection with nature. The theme may revolve around the beauty of the ocean and the thrill of exploring it.

Environment: The setting of the video is likely underwater, possibly in a tropical or exotic location with clear blue waters. The presence of a dolphin suggests that the video may be filmed in a location known for its marine life.