GEBCO’s current gridded bathymetric data set, the GEBCO_2024 Grid, is a global terrain model for ocean and land, providing elevation data, in meters, on a 15 arc-second interval grid. It is accompanied by a Type Identifier (TID) Grid that gives information on the types of source data that the GEBCO_2024 Grid is based on.
This release includes a version of the grid with under-ice topography/bathymetry information for Greenland and Antarctica.
Original source: https://www.gebco.net/data_and_products/gridded_bathymetry_data/