On Thursday, August 29th, we tested CASSy the first time in real water. With the help of our collegues from the Bundeswehr (special thanks to Dr. Jan Abshagen and Dr. Arne Stoltenberg) we were able to put CASSy into the Baltic sea. After fixing some engine problems, we had your first "cruise" - a short trip from Kiel to Mönkeberg and back. Everything worked fine. Now, we feel confident to go on and put some "science" on CASSy for the next cruise. If you are interested you can find some more details on CASSY (and MISSy) here.