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Maritime Stepping Stones (MaSS) is the successor of Wrecks in Situ (WIS), an interactive website designed to increase access to underwater cultural heritage for the general public. WIS came forth from MACHU, a three-year European project on managing cultural heritage underwater.

The redesign of WIS was an initiative of the International Programme for Maritime Heritage of the Cultural Heritage Agency of the Netherlands (RCE) that ran from 2017 to 2021.

The data has been gathered since 2010 by archaeologists, students and volunteers. All data is open data, licensed under the Creative Commons Attribution-ShareAlike license (CC BY-SA).

MaSS was designed and built in Utrecht by Ylab designers for interaction.