SMS Coln
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily — treat everything here as planning ranges.
Coln is the fleet's beauty: the most complete of the four remaining cruisers, lying on her starboard side with bow, anchor capstans, bridge area and stern all present in one continuous, comprehensible ship. Swimming her length from the elegant raked bow past deck guns and davits to the stern feels like touring a museum hull that happens to be 30 m under the Flow. Shoals of saithe hang along the deck edge, anemones crowd every rail, and low visibility only adds theater as sections materialize out of the green. If you dive one German cruiser, this is the one.
The moment you come for: Near-complete WWI cruiser, bow-to-stern swim, deck fittings still in place
Topography: A largely intact light cruiser on her starboard side in about 35–36 m
Entry: Shotline onto the port side of the hull; dived year-round when boats run.
Know before you splash
Hazards: Depth and dark; open hatches tempt penetration that belongs to trained teams with lines and lights.
Conservation: Scheduled monument — the completeness that makes her special depends on divers taking nothing.
Nitrox: Worth it here — profiles sit in the range where enriched air meaningfully extends no-stop time (with the training to use it).
For photographers
Wide angle: ★★★★★ · Macro: ★★☆☆☆ — editors' 1–5 rating of what this site gives each style of shooting