concrete pods protecting a seawall along the harbour in heraklion, crete.

heraklion harbour wall prevent protect outdoor industrial closeup background flood prevention stack pile sea protection barrier tetrahedral coastal defences wavedissipating abstract engineering structure management infrastructure erosion stones interlock building blocks sky blue ocean concrete defence construction landmark texture water cement landscape architecture coast rock stone material tetrapod crete greece europe 2023 manmade providing harour agean pods protecting seawall