Straussee and Stechlinsee publish rental and fill services; Werbellinsee advertises local base support, but its 2026 relocation makes reconfirmation essential. Reserve uncommon suit sizes, drysuit systems, cold-water regulators, cylinders, and guides. Stechlinsee will not fill cylinders without valid technical inspection. Separate wet gear from passenger luggage, carry a waterproof changing mat and bins, and avoid transporting full cylinders unsecured. Airlines may accept empty, valve-open cylinders only under specific dangerous-goods rules, so rental is normally simpler. Confirm whether weights, computer, hood, gloves, and lights are included rather than assuming a full package.