31.   While oil spills are a rarity at offshore drilling platforms, especially compared with oil-bearing tankers, many environmental groups argue that offshore rigs are a constant threat.

32.   Police arrested three Greenpeace activists on Sunday, four days after the group boarded a Norwegian offshore drilling rig to protest exploration for new oil and natural gas fields.

33.   A blast of natural gas rocked an offshore rig in the Gulf of Mexico early Friday, and one worker was missing.

34.   American oil company Unocal said Tuesday it would begin returning workers to offshore rigs.

35.   Dolphin provides services such as diving, underwater engineering, management of sophisticated multipurpose support vessels, geotechnical services and repair of offshore rigs.

36.   In Newfoundland, workers on offshore rigs prepared for gale and storm-force winds.

37.   It repairs, modifies and improves offshore drilling rigs.

38.   Oil workers on Tuesday said they may expand a month-long strike on offshore drilling rigs after state-led negotiations failed to break a contract deadlock.

39.   The McNulty yard, located near Newcastle, equips ships and offshore rigs for oil production.

40.   The purchase makes UHM the only Russian company with expertise in offshore rig construction, which will become increasingly important as drilling activity in the Caspian Sea increases.