In November 2017 we finished our first "DFG-Großgeräteantrag" with CASSy as a part of it. At this time we recognized that MISSy is too light for larger SONAR equipment and that we need a slightly larger "sister" for MISSy. Thus, we discussed how CASSy could look like and what features and properties are required. Finally, we added CASSy to the proposal. Now, we keep our fingers crossed to get the approval for CASSy.