Benthic Terrain Modeler is a toolbox for ArcGIS for Desktop that enables users to extract new information from bathymetric data. The new version, 3.0, features exciting new capabilities such as an expanded list of depth statistics, new tools for analysis of benthic data across multiple scales, and more. This new release also utilizes the NumPy library and acts as a working example of how the package can be integrated with ArcGIS for Desktop to create powerful geoprocessing tools and workflows.