Mood: The mood of the video appears to be one of behind-the-scenes excitement and creativity, showcasing the making of an underwater sequence in a film. The theme seems to revolve around the challenges and beauty of filming underwater, highlighting the effort that goes into creating visually stunning scenes. The emotion conveyed is one of anticipation and curiosity, inviting viewers into the process of bringing cinematic magic to life.

Environment: The setting of the video is underwater, likely in a controlled environment such as a swimming pool or a tank, given the presence of a camera rig and a person in a diving suit. The greenish hue of the water and the artificial lighting suggest a man-made setting rather than an open sea. The environment seems to be one of a film set, with equipment and crew members working to capture a scene.