DatumDeep

How deep can things go? DatumDeep is a museum in your pocket. One continuous vertical column of ocean, from the sunlit surface to the crushing darkness of Challenger Deep at 10,935 metres. Scroll through the abyss and discover over 300 curated entries — shipwrecks, submarines, sea creatures, geological features, diving records, and ocean infrastructure — each placed at its true depth. Watch the world change as you descend. Sunlight fades. The water darkens. Bubbles rise past you. ASCII fish swim through the shallows. Jellyfish pulse in the twilight zone. Squid dart through the midnight depths. Anglerfish drift in the abyss, lures glowing. Bioluminescent particles flicker in the darkness. Go deep enough and the screen itself begins to crack under the pressure. Every entry is a story. The Titanic at 3,800m. Bismarck at 4,791m. The Sullivan brothers' ship USS Juneau at 4,200m. K-129, the Soviet submarine the CIA tried to steal, at 4,900m. The snailfish filmed at 8,336m — the deepest fish ever recorded. The HMS Thetis, the submarine that sank, was raised, renamed Thunderbolt, and sank again. The colossal squid. The Mariana Trench. The Kola Superdeep Borehole. Over three hundred entries, each with detailed editorial text covering the history, science, and stories behind every depth. DIVE — Scroll the ocean from surface to seabed. A live header tracks your current depth, pressure, temperature, and light level as you descend. Zone markers divide the ocean into photic, twilight, midnight, abyssal, and hadal zones. Quick-navigation buttons jump between zones. The background subtly shifts as you pass through each depth band. Scale references — the Eiffel Tower inverted, Ben Nevis, the height of Everest — give you a sense of the distances involved. CATALOG — Browse, search, and filter the complete database. Search by name, location, or keyword. Filter by category: wrecks, submarines, creatures, geology, records, infrastructure, and fiction. Sort by depth, year, or name. Every entry links back to its position on the dive column and can be added to the compare view. COMPARE — Place any two entries side by side to visualise the depth difference. See the pressure delta, the temperature difference, and a scale equivalent to make the numbers real. How much deeper is the Titanic than a nuclear submarine's crush depth? Select them and find out. CONFIG — Choose your phosphor. Green or amber, like a proper sonar display. Switch between metres and feet, atmospheres and bar and PSI. View database statistics broken down by category. The entire interface is rendered in a Cold War-era CRT phosphor aesthetic — monospaced typography, scan lines, text glow, dark backgrounds. Think sonar room aboard a submarine, not a modern app. Every pixel serves the atmosphere. DatumDeep is completely offline. No network connection required. No tracking. No accounts. No subscriptions. Just the ocean, the data, and the dark. Descend.