Hibernia Gravity Base Structure

A 600-kilotonne gravity base structure (GBS) built after the Ocean Ranger disaster, it sits in 80 metres (44 fathoms) of water directly on the floor of the North Atlantic Ocean 315 kilometres (196 mi) off St. John's, Newfoundland at 46°45′1.57″N 48°46′58.54″W / 46.7504361°N 48.7829278°W / 46.7504361; -48.7829278.

In addition, unusual design situations resulted from the construction methods and the structural components used.

The majority of the construction was performed at a site in Bull Arm, Trinity Bay, Newfoundland and Labrador.

The 550,000-ton slipform concrete GBS was built inside a drydock and mated with the topsides in the nearby deepwater construction site.

Kiewit performed outfitting of equipment inside utility shafts and provided construction management services for the gravity base structure.