Frigg is a field in the central part of the North Sea, straddling the border between the UK and Norwegian sectors. The water depth is 100 metres. Frigg was discovered in 1971, and the plan for development and operation (PDO) was approved in 1974. The field was developed with a living quarters facility (QP), two process facilities (TP1 and TCP2) and two drilling facilities (DP2 and CDP1). TP1, CDP1 and TCP2 had concrete substructures and steel frame topsides. The two other facilities had steel jackets. CDP1, TP1 and QP were on the UK part of the field. The facilities on the field also treated oil and gas from the fields Frøy, Nord Øst Frigg, Øst-Frigg, Lille-Frigg and Odin. Production started in 1977.