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![The development of hydraulic concrete by the Romans for coastal underwater structures began most probably somewhere in the vicinity of Baia and at sometime before the last quarter the 2nd century BC ( The development of hydraulic concrete by the Romans for coastal underwater structures began most probably somewhere in the vicinity of Baia and at sometime before the last quarter the 2nd century BC (](https://web.uvic.ca/~jpoleson/New%20Material/Baia%202006/Baia06%20Fig%2002.jpg)
The development of hydraulic concrete by the Romans for coastal underwater structures began most probably somewhere in the vicinity of Baia and at sometime before the last quarter the 2nd century BC (
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