The acoustic data is separated into different categories of plankton: fish, fish without swimbladders, gas bearing plankton, plankton, and total backscatter for the RRS James Clark Ross and RRS Discovery cruises. The data is for every nautical mile along the transit and separated into 19 depth bands (in one set of files) or aggregated together (in another set of files). The whale and bird number of each species are reported for each day. These research cruises were co-funded through partnerships between the Foreign, Commonwealth and Development Office, through the Blue Belt program run by Cefas & MMO, and UKRI through the British Antarctic Survey (BAS) National Capability - Official Development Assistance program (NE/R000107/1 and NE/T012439/1).

We present a new gridded bathymetric compilation around Tristan da Cunha here defined by the following bounding box: 5 to 16.8W, 33 to 43.5S. This bathymetry grid was compiled from a variety of multibeam swath bathymetry data acquired during 7 different cruises (see lineage). The data is available as a grid of 0.001 degrees resolution in three different formats: NetCDF, ArcView ASCII and GeoTIFF formats using geographic coordinates on the WGS84 datum. This grid is an output of the UK FCDO 'Blue Belt' program and the following Natural Environment Research Council (NERC) BAS-ODA fundings: NE/R000107/1 and NE/T012439/1.