The Baltic Basin is known for its numerous Paleozoic hydrocarbon reservoirs. There is published evidence that hydrocarbons are leaking from the seafloor, however, little is known about the hydrocarbon migration pathways from Paleozoic source and reservoir rocks towards the seafloor and the escape structures. To investigate the processes involving fluid migration in shallow depths and seafloor fluid escape, we utilized sub-bottom profiler data from the eastern margin of the Gotland Deep. The data was acquired during the 2021 M177 Meteor expedition led by the University of Hamburg. Data acquisition was carried out using the hull-mounted transducer of the PARASOUND system that emits a 4 kHz signal penetrating the first several tens of meters below the seafloor. The data was digitized and stored in SEG-Y format (FFID in byte header 9-12, shot x-coordinate in byte header 73-76 and shot y-coordinate in byte header 77-80). Processing included geometry setup (UTM zone 33N) and bandpass filtering.