This dataset is an archive of the following original data for the seismic reflection surveys conducted by the BGS in Bangladesh for PetroBangla (Bangladesh state oil & gas company) and the UK Overseas Development Agency (funding body): Observers' logs, Surveyors' reports, Location data tapes, Field data recording tapes, Processed data tapes and various stages of processing: demultiplexed field data to migrated stack (not all available for all profiles). These data are kept as archive copies. They are only available with the agreement of PetroBangla and the ODA. Approx. written records and approx. 1200 tapes.