Cinematic Disaster Frame: London Mega Tsunami Image Prompt

A cinematic disaster movie storyboard frame of central London, UK, showing a recognizable modern London cityscape with Big Ben and the Houses of Parliament in the distance, busy streets, red double-decker buses, pedestrians and realistic urban details. The atmosphere is initially calm but ominous, with dark storm clouds gathering over the city and an unnatural wall of ocean water visible far in the background, approaching London at massive scale. Photorealistic disaster-film aesthetic, believable British architecture, realistic vehicles and people, dramatic natural lighting, atmospheric depth, detailed wet surfaces, large-scale environmental realism, grounded physical proportions, cinematic composition, 35mm anamorphic lens, subtle film grain, high-end Netflix-style disaster movie frame, no text, no logos, no fantasy elements.