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Another episode of the National Geographic's MegaStructures series. This film is dedicated to steel -man mande and definitely one of the strongest materials existing on earth. Watch this interesting video and you will see the innovations the steel made possible. It comes without saying that steel is the most popular and core material for the construction of ships, offshore platforms and any other kind of floating facilities. That is why it makes sense to understand how the steel can be used, what are the advantages and possible limitations.