keep the entire scene exactly as it is do not modify yacht geometry hull color stern platform sea sky lighting jet skis furniture shadows materials yakamoz signage add one element only place a personal submarine on the stern platform lower teak deck centered and aligned with the yacht axis the submarine must be realistically scaled approx 3 meters length sit naturally on the teak surface generate accurate contact shadows respect current sunlight direction modify the submarine exterior color to perfectly match the yacht hull navy blue deep marine navy satin marine coating no glossy car finish preserve all panel detailing keep the transparent acrylic dome canopy exactly as designed with realistic refraction and subtle reflections the submarine must look like part of the yacht equipment naturally integrated photorealistic no scene reinterpretation no compositional changes no color grading no lighting adjustments this is a strict additive edit preserve the original render 100 only insert the submarine
