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. 2021 Apr 22;11:8773. doi: 10.1038/s41598-021-87743-5

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© The Author(s) 2021

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 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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Sonar side scan images from the deep hole DH1, (A) Lake bottom in top view from the boat with a side-scan swath of 25 m. (B) Track of the boat. (C) Water column in profile view beneath the boat above deep hole DH1 with rising gas bubbles.