The TOBI survey was almost enterely devoted to the central group of islands (Terceira, Pico, Graciosa, Faial and Sao Jorge) where seismotectonic studies show an extensional regime with structures lying parallel to the Terceira Ridge. The Terceira Ridge, originally thought to be the westernmost boundary between the Euroasiatic and African plates, is also considered to act as a slow spreading axis or as a leaky transform fault. For this reason the survey was planned and carried out along the Terceira Ridge, with a WNW-ESE direction, and along other parallel volcanic ridges. The high quality images gained during the Azzorre99 cruise, where submarine volcanoes and associated fault systems were spectacularly revealed, will throw much new light on this poorly known area. Data processing to be performed at the SOC during the next few months will further improve the images of these structures and will make it possible for us to develop an understanding of the relationship between onshore and offshore structures. At this early stage, it seems reasonable to be optimistic that the quality and amount of data acquired will lead to several high quality research publications.