In contrast of Kriegsmarine's Schwimmende Flakbatterien(floating AA battries), Luftwaffe developed their own AA ship. Classified as Flugsicherungsboot or Flaktrajer, "Krischan der Große" was the first and the only one.
Not to confuse with "Krischan" class seaplane tender, which is another ship with differient function.
Let's walk around.
Famous 88 AA gun
3.7cm AA gun and bridge
Armor plate of the bridge
Range finder(Arrow), two Quad-Flak 38
Waterbomb or depth charge on both port and starboard