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. 2021 Apr 22;11:8762. doi: 10.1038/s41598-021-88062-5

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Long-term spectrogram of data recorded on the eastern side of the Chagos Archipelago (DGS site) in 2017: Chagos songs are a major component of the central Indian Ocean underwater soundscape and have been so for nearly two decades. The acoustic energy in the parallel horizontal frequency bands outlined in the black box are Chagos songs. Spectrogram parameters: 6 h averaging window, 50% overlap, FFT window of 120 s.