This document reports on the 1st release of the underwater services and the software underlying each service. This report, NEANIAS deliverable 2.4, is published right after the first thematic underwater services release, i.e., deliverable D2.3 and the initial validation phase based on mostly internal end-users. The U1 [UW_BAT] “Bathymetry mapping from acoustic data service implementation” provides an advanced user-friendly, cloud-based version of the popular MB-System software, for processing bathymetric data through Jupyter Notebooks. The U2 [UW_MOS] service “Seafloor Mosaicking from Optical Data” delivers 2D/3D mosaics produced by a set of images and navigational data. The expected output is achieved by a processing pipeline based on in-house solutions and open-source libraries. Finally, the U3 [UW_MAP] service “Seabed Classification from Multispectral, Multibeam Data” provides an easy-to-use, cloud-based solution incorporating machine learning frameworks in order to identify different seabed classes. For each released service a point-of-access is provided, as well as the relevant documentation, which is organized under NEANIAS docs service at https://docs.neanias.eu/en/latest. Services reported here have gone through the first release round, most services have been integrated to NEANIAS authentication system service, the documentation workflow, and integrated with GARR infrastructure services. As expected, this first services milestone uncovered some gaps in the services deployment stack and integration with other core and delivery services will be addressed for the next milestones and releases.