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. 2017 Jun 22;8:15872. doi: 10.1038/ncomms15872

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Copyright © 2017, The Author(s)

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/

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(a) A high-resolution sub-bottom profile image revealing semi-blanked zone within the sediments; black arrow pointing to the black rectangle shows position of the borehole drilled to validate the observed acoustic anomaly; (b) change with depth in gas content observed in the recovered sediment core. The concentration of gas below the boundary identifying the acoustic anomaly increased by two orders of magnitude, allowing us to interpret the observed acoustic anomaly as being due to the presence of gas in the sediments.