Gray-scale vintage diving helmet with portholes and rivets

The tattoo on the person's forearm depicts a vintage deep-sea diving helmet. The helmet is rendered in a realistic style with detailed shading to emphasize its rounded, metallic surface. It features a large, circular front window with crossbars, and smaller side ports, all designed to give a three-dimensional appearance. The shading highlights the contours and rivets of the helmet, creating a sense of depth and texture. The tattoo captures the classic, nostalgic look of early diving equipment, emphasizing bold lines and tonal contrasts to make the design stand out.