22 May MONA Turrel wing Posted at 07:04h in Marine Construction by joycedesign 0 Likes Share Drive 20 piles, most on 60 degree rake, construct 4m x 4m headstocks 2m underwater using coffer dam. 300t of precast elements including some 35t Client: MONA Date completed: June 2017 Description of works: $1M