Description: The Tyrrhenian Basin is the youngest basin of the Western Mediterranean Sea. It is assumed that the rifting and opening of the basin is caused by slab rollback during the latest phases of subduction of several segments of the Tethys oceanic lithosphere. Rifting processes in the Tyrrhenian have been continuous since the late Miocene. The advantages of studying this young basin are the well preserved, undeformed conjugated margins which are close to each other and covered only by thin sediments. Furthermore, the extension factor increases from North to South making it possible to investigate different stages of rift structures. This makes the Tyrrhenian Basin a unique natural laboratory to study continental break-up and rift processes which are still not fully understood. In a collaborative project with partners from Spain and Italy new seismic data were acquired during a two-ship experiment in April and May 2010. The Spanish vessel Sarmiento de Gamboa operated an airgun array and a 4 km long seismic streamer for collecting MCS data. The Italian vessel Urania was used for deployment and recovery of 25 IFM-GEOMAR Ocean-Bottom-Hydrophones which were recording refraction and wide-angle seismic data on that profiles. At the DGG 2011 we will present first results of a seismic transect crossing the Tyrrhenian Sea between Sardinia and Italy at 41°N.