The raw SeaSpy magnetometer data presented here were collected in the Southern Ocean (SO) as part of the ISOBatA PNRA project during the XXXVII and XXXVIII Italian Antarctic expeditions on board the icebreaker Laura Bassi. The ISOBatA project (Italian Southern Ocean Bathymetry from consistent exploitation of opportunistic seafloor datasets in the Antarctic region and surrounding areas) aimed to improve the understanding of the Southern Ocean through a novel approach that systematically integrates the collection of bathymetric and magnetometric data during the Laura Bassi voyages in poorly charted regions between the Macquarie Triple Junction – MTJ and the Emerald Fracture Zone n-EFZ. This dataset spans two field campaigns (2021-2022 and 2023) collected through optimized navigation strategies, including reducing vessel speed during transits and following pre-planned corridors to enhance data quality and spatial coverage. The project was a collaboration between OGS (PI D. Accettella), UniMIB (A. Savini), IGAG-CNR (M. Cuffaro) and INGV (F. Muccini). The work was supported by the Programma Nazionale di Ricerca in Antartide - PNRA and benefited from the joint efforts of the Laura Bassi research teams on board. Keywords: Southern Ocean, Bathymetry, ISOBatA, Laura Bassi, Antarctica, IBCSO.

The Antarctic Seismographic Argentinean Italian Network (ASAIN) is a permanent broad-band seismic network that has operated since 1995 in the Scotia Sea region, the Antarctic peninsula, and the polar area. It was deployed and is managed in the framework of cooperation between the National Institute of Oceanography and Applied Geophysics and Dirección Nacional del Antártico–Instituto Antártico Argentino and is financially supported by the Programma Nazionale di Ricerca in Antartide. The network consists of eight seismological stations with broadband sensors. ASAIN provides data to Incorporated Research Institutions for Seismology, Observatories and Research Facilities for European Seismology, and GEOFOrschungsNetz. It improves the worldwide seismic networks’ detection capabilities and contributes to refining regional earthquake locations released by the U.S. Geological Survey. The proximity of the seismic stations to the Antarctic continent and their continuous operation in the long term also allows for having a privileged observatory on the ice-related seismicity along the Antarctica peninsula.