Meanwhile, Diamond Offshore has confirmed the semi-submersible rig Ocean Endeavor, currently under contract to ExxonMobil in the Gulf of Mexico, evacuated safely yesterday.
The evacuation was by the slick from Macondo, which is heading towards the unit.
The Ocean Endeavor was drilling the Mica prospect on Mississippi Canyon Block 211.
A US Coast Guard spokeswoman told Upstream the drillship was expected to arrive on scene on 2 May.
Transocean