Aerial surveys of the US Gulf have provided a first glimpse of the extent of damage to the region's offshore drilling fleet.

Contract driller Rowan has yet to locate its LeTourneau 52-class slot jack-up Rowan-New Orleans. The company fears the unit, which had been secured at its pre-storm location in Main Pass block 185, capsized and sank in the storm.

The rig was insured for $8.5