dolphin No.1 is purposed for passenger gangway therefore a steel deck area 24m x 4.5m is erected on top of piles to support passenger trunk and gangway.piles are made of steel pipe totally 19 piles. pipe length above lowest water level is 3.5 m. welding seams look moderate condition (few cracking or parting can be seen), steel texture gets medium corrosion but overall thickness is believed in rage.