This picture shows workers leaving the Visund by helicopter. It also gives a very good view of one of the free-fall lifeboats on the facility. The lifeboat is completely enclosed. Inside, the bottom of the lifeboat is not flat, but instead is 'ridged' so that at the angle it is seen at here, it acts as a stairway. Once full and ready to launch, the lifeboat is detached from the rig and falls into the water. The angle it hits the water at means that it submerges and only comes to the surface when it is safely away from any burning oil around the facility.
For more information about the Visund, see picture #224
Picture Courtesy of Statoil
Picture added on 12 December 2006