O2 proposes to develop a programme of work that will integrate open-source offshore geological and geophysical subsurface data for continental shelves including the subduction and transform plate boundaries across the globe. The funding support will be sought from National Institutes. This subsurface data archive will provide a single source of detailed geophysical information. The data will be reviewed to highlight potential geohazard risks. The archive is developed to serve as an initial resource for site risk assessment. Some of data sources to be integrated include:

1. Australian Government, Geoscience Australia, National Offshore Petroleum Information Management System (NOPIMS): https://nopims.dmp.wa.gov.au/nopims
2. British Oceanographic Data Center: https://www.bodc.ac.uk/
3. Geological Survey of Japan: https://gbank.gsj.jp/geonavi/?lang=en and https://gbank.gsj.jp/sbp_db/pages/cover-E.html
4. Japanese Coast Guard: https://www.msil.go.jp/msil/htm/main.html?Lang=1
5. Japan Agency for Marine-Earth Science and Technology: http://www.jamstec.go.jp/e/database/ and http://www.jamstec.go.jp/obsmcs_db/e/
6. Published data (see, e.g., https://doi.org/10.1038/s41597-021-00969-w)
7. Data collected by programmes of work in O1, O3 and O4.
8. Data provided by TGSG Consortium and Supporters members, for public open access.
9. Marine geohazard maps of the Italian seas provided by the Italian Civil Defence Dept. (https://github.com/pcm-dpc/MaGIC).
10. Marine geohazard are the Norwegian MAREANO project (https://mareano.no/en), the Irish INFOMAR (https://www.infomar.ie)

TGSG will make all collated data available, either directly or cross-linked, from a single portal site hosted by the SSSGR secretariat. By doing so it will provide a global mapping/archive of submarine geological and geophysical data (D2).