The COSLRival is an Aker H3 semisubmerisble accomodations rig, built as Borgila Dolphin in Japan, delivered in August 1976. The following was the re-build at Blom-Voss Before commencing the Norsk Hydro contract at Oseberg, the rig stayed at Oseberg from 1998 until 2003. The existing accommodation facilities were removed down to bare steel to enable a new layout for 48 persons in 2-men cabins with sanitary facilities. 38 persons were accommodated in a new containerised living quarter. A 600 ton stiffleg crane had to be removed. This position was used to install the telescopic gangway with access tower and lay-down rack. Four new anchor winches for 76 mm K4 chains were installed to enable 12-point mooring of the rig. The remaining winches were overhauled and modified for double-brake system, emergency release including comprehensive hydr. pipe work and cabling hooked up. In 2003 - 2004 the rig underwent a major re-build to be converted into a flotel, this was done at Gdansk Remontowa.