Seismic refraction experiments were conducted in four locations in the Whirlwind Inlet, Larsen C Ice Shelf, with the main purpose of estimating firn density profiles. The data were collected as part of NERC Project MIDAS. The locations, procedures and raw data files produced along with quality descriptions are all summarised in the observer''s log provided along with the datasets. Funding was provided by NERC Standard Grant ''Impact of surface melt and ponding on ice shelf dynamics and stability'', 2014-2017, NERC Reference NE/L005409/1.

Seismic refraction experiments were conducted in eight locations along a flowline originating in the Cabinet Inlet, Larsen C Ice Shelf, with the main purpose of estimating firn density profiles. The data were collected as part of NERC Project MIDAS. Funding was provided by NERC Standard Grant ''Impact of surface melt and ponding on ice shelf dynamics and stability'', 2014-2017, NERC Reference NE/L005409/1.