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. 2019 Apr 29;9:6615. doi: 10.1038/s41598-019-43027-7

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© The Author(s) 2019

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/.

PMC Copyright notice

High resolution bathymetry (0.05 m) (obtained from the CNR-ISMAR data using the software CARIS HIPS and SIPS v.9, http://www.teledynecaris.com/en/products/hips-and-sips/) and images relative to the main categories of relatively small dimension anthropogenic morphologies found on the sea-floor. The copyright of the picture of the cable belongs to the CTBTO Preparatory Commission; this picture has the license CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) and was downloaded without modifications from the link https://www.flickr.com/photos/ctbto/3816716741; the picture of the wreck was downloaded from the link https://commons.wikimedia.org/wiki/File:MV_Rozi_01.jpg; the pictures of the submerged tyre and rip-rap are by Riccardo Fiorin, Laguna Project Snc, whereas the pictures of the briccola and the dock piles were taken by the main author.