The objective of deliverable D2.2 is to report on the final set of service requirements, software specifications and upcoming development plan of the foreseen Underwater Research Services.

These three services aiming at providing operational cloud solution for: i) Bathymetry mapping from acoustic data service implementation (U1), ii) Seafloor Mosaicking from Optical Data (U2), and iii) Seabed Classification from Multispectral, Multibeam Data (U3). This document reports on Underwater end-user communities, involved datasets and products as well as the current status of employed software and services. Then it presents results from the service requirement validation based on current software releases. While the U1 service has not yet completed the 2nd release (due on 31st October  2021), a series of validation trials and dissemination actions involving end-users of all the underwater sector on the 2nd release of U2 and U3 services have resulted in working towards the final set of the end-users requirements and software specifications, marking a considerable progress towards the employment of novel, user-friendly, automatised and efficient novel EOSC underwater services to be further developed at the 3rd release. This was the result of a very intense collaboration between the developers, the technical team, the end-users communities of NEANIAS as well as external advisors of NEANIAS. As the U1 service was not ready at the due date of the 2nd release no U1 service end-user validation trials and dissemination actions have been performed. Hence at the time the U2 and U3 services performed the end-user trials no specification and requirements could be retrieved from the end-users to improve the U1 service based on the end-user feedback.