Operator Premier Oil has suspended operations on the 4/20-1 (Isobel Deep) well, following a problem detected on the drilling rig blowout preventer, BOP, according to partner Falkland Oil and Gas Ltd.

Blowouts are easily the most dangerous and destructive potential disasters in the world of oil drilling ... called a "BOP stack." BOPs come in two main types: annular preventers and ram preventers.

ENSCO 51 was on location in Eugene Island Block 273 drilling ... annular flow was detected. The volume of the gas discharge continued to increase. All personnel were safely evacuated from the rig.