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ROTTERDAM, NETHERLANDS - Jan 28, 2021: Heerema Marine Contractors' semi-submersible crane vessel Thialf is waiting for maintenance in the port of Rott Stock Photo - Alamy
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File:Kraanwerkschip Thialf & diepwaterconstructieschip Balder - Calandkanaal - Port of Rotterdam (24720426934).jpg - Wikimedia Commons
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