Black marine depth and underwater icons on white background

A clean set of black line icons is arranged on a white background, showing a diving helmet, a submarine, a water depth marker with wave lines, and a coral shape. The simple vector-style outlines feel technical and educational, with generous negative space around each symbol. Strong contrast makes the forms easy to read and suitable for signage, infographics, or marine-themed design systems. The composition is evenly spaced in a four-quadrant layout, giving each icon room to stand out. No color accents or textures appear beyond the bold black strokes, which keeps the image minimal and flexible for graphic use. The subject matter points to ocean exploration, underwater measurement, and nautical communication without any extra visual clutter. Overall, the mood is orderly and functional, like a reference sheet for sea-life or diving related visuals.