The alarm was sounded after a suspected gas leak on a Transocean-owned rig docked at a yard on Norway’s west coast on Thursday, according to a report.
The semi-submersible Transocean Leader was evacuated after the alarm was triggered at around 10am but the emergency was called off after about 30 minutes, Norwegian newspaper Bergens Tidende reported.
The rig is undergoing maintenance and a class survey at the Bergen Group yard at Askoy.
“This is standard routine with indications of a possible gas leak,” said yard chief Stig Trygve Andersen.
Firemen were carrying out an inspection onboard the rig but the nature of the suspected leak or the source of the gas had not yet been determined.
Statoil was given the green light on Thursday by Norway’s Petroleum Safety Authority to use the 1987-built harsh-environment deep-water rig for production drilling and well completions on its Tyrihans field in the Norwegian Sea, with work set to start in mid-December.