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[Did you know - CEDD series] Why do some rocks laid on shorelines look so weird?

Apart from projects on land, the Civil Engineering and Development Department (CEDD) is also responsible for building , checking and maintaining seawalls and breakwaters. For safe and efficient port operations and to reduce damage to marine facilities brought by waves, the regular maintenance of port facilities is particularly important. Maintaining over 130 kilometres of seawalls and breakwaters is one of the tasks needed.A seawall is used as a division between land and ocean to protect a shoreline from erosion against waves and current actions. A breakwater is to reduce wave action in a water area like a harbour or typhoon shelter and thus avoids casualties or facility damage. (The video is in Chinese)