Interiors are boundaries between cell zones or the facets that make up the volume mesh and should be left alone. There are exceptions, but this isn't one of them.
I assume you mean Ansys Meshing and not CFX? Did you set Fluent as the CFD solver at the mesh stage?
Bottom is -5.6m? Double check the wave height definition, I can never remember if it's amplitude or displacement from mean.
You are navigating away from the AIS Discovery experience