ST Engineering's marine arm ST Marine announced Wednesday it has won a S$171m ($139m) contract from Swire Pacific Offshore Operations (SPO) to build and outfit four anchor handling tug supply (AHTS) vessels. Work on the contract will commence immediately with the first AHTS expected to be delivered by the first-half of 2013 and the fourth by the first-half of 2014. “We are delighted and honoured to be entrusted with this opportunity to work with SPO again,” said Ng Sing Chan, president of ST Marine. In March this year, ST Marine delivered a seismic survey vessel to SPO.