A dataset containing re-sampled data used to optain the results presented in the paper 'Detecting silent whales using seabed fibre optic cables' publised in in PNAS, 2025. It contains re-sampled time-differentiated phase hdf5 file measured by an OptoDAS interrogator through a dark fiber in a submarine telecommunication cable. This fiber is trenched into soft sediments at 0-2 m below the seafloor from Longyearbyen to Ny-Ålesund in Svalbard, Norway. The raw data used in the analysis acquired over different time periods between 2022-08-05 and 2025-09-05. To reduce file sizes, we resampled the raw data to a new Nyquist sampling rate well above the highest frequency of interest, and archived the data accordingly. Additionally, only the channels containing the signal of interest is included in the file thereby re-sampling the distance axis as well. This data set has no exact positioning data of the fiber optic cable, because they are proprietary to SIKT. However, approximate cable positions have been extracted from https://www.norgeskart.no/ and included inside the dataset. The fibre position in norgeskart can be found my changing the base layer to 'Nautical charts overview'.