passenger ship sails into water chamber lock river danube melk austria |
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| navigate by keyword : locks danube river dam industrial building lift ship boat cruise transport stransportation waterways structure floodgate gate lock chamber canal outdoor day light technology travel taveling sailing sculler wall concrete construction raising lowering boats ships stretches different levels passenger chamberlock melk austria sails |
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| River locks for raising and lowering boats and ships between stretches os water of different levels on river |
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