Valenti Sallares, Institute of Marine Sciences-CSIC, Barcelona, Spain, Irene Merino, Barcelona Center for Subsurface Imaging, CSIC, ICM, Barcelona, Spain, Manel Prada, ICM-CSIC, Barcelona-CSI, Geosciences, Barcelona, Spain, Cesar R Ranero, ICREA at Institute of Marine Sciences-CSIC, Barcelona, Spain, Ingo Grevemeyer, GEOMAR, Kiel, Germany, Alcinoe Calahorrano, Institute of Marine Science -CSIC, Barcelona, Spain, Alejandra L. Cameselle, University of Vigo, Vigo, Spain and Marta Neres, Instituto Portugues do Mar e da Atmosfera, Lisbon, Portugal