Germany is a cold-water destination built for divers who like variety and structure. Split your planning between three water worlds: Baltic Sea shore and wreck-style dives, the North Sea fringe where tides and weather drive decisions, and a deep bench of inland lakes and flooded quarries that stay diveable in most months. Expect thermoclines, lower visibility than the tropics, and water temperatures that can swing from 1°C to 21°C depending on season and depth. Start with easy logistics and repeatable conditions at Car Wrecks Hemmoor, then add alpine walls and novelty wrecks at Walchensee, Am Hackl (VW Kaefer) or Baltic shore days near Campingplatz Wallnau Fehmarn. For snorkelers and non-divers, Germany's summer lake-and-sauna culture is the secret weapon.