Songa Mercur

The Songa Mercur is a semi-submersible drilling rig designed by Friede & Goldman, ex "Shelf 10" and "La Muralla". It is capable of drilling in water up to a depth of .
In May 2006, Songa Offshore signed a nine-month contract with Chevron to use the rig in Australia. A contract was later signed with Santos Limited, which was originally nine months and was extended to a year and then a year and a half. In 2013, the rig was contracted by Idemitsu Oil and Gas for drilling off Vietnam.
In 2014, Songa Offshore sold the rig to Opus Offshore as a part of the deal creating Songa-Opus joint venture.